diff --git a/conf/default.conf.php b/conf/default.conf.php
index 77ec9c166f..9d79cbd2be 100644
--- a/conf/default.conf.php
+++ b/conf/default.conf.php
@@ -1,639 +1,643 @@
 <?php
 
 /*
  * Copyright 2011 Facebook, Inc.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *   http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
 
 return array(
 
   // The root URI which Phabricator is installed on.
   // Example: "http://phabricator.example.com/"
   'phabricator.base-uri'        => null,
 
   // If you have multiple environments, provide the production environment URI
   // here so that emails, etc., generated in development/sandbox environments
   // contain the right links.
   'phabricator.production-uri'  => null,
 
   // Setting this to 'true' will invoke a special setup mode which helps guide
   // you through setting up Phabricator.
   'phabricator.setup'           => false,
 
   // The default PHID for users who haven't uploaded a profile image. It should
   // be 50x50px.
   'user.default-profile-image-phid' => 'PHID-FILE-4d61229816cfe6f2b2a3',
 
 // -- IMPORTANT! Security! -------------------------------------------------- //
 
   // IMPORTANT: By default, Phabricator serves files from the same domain the
   // application lives on. This is convenient but not secure: it creates
   // a vulnerability where an external attacker can:
   //
   //  - Convince a privileged user to upload a file which appears to be an
   //    image or some other inoccuous type of file (the file is actually both
   //    a JAR and an image); and
   //  - convince the user to give them the URI for the image; and
   //  - convince the user to click a link to a site which embeds the "image"
   //    using an <applet /> tag. This steals the user's credentials.
   //
   // If the attacker is internal, they can execute the first two steps
   // themselves and need only convince another user to click a link in order to
   // steal their credentials.
   //
   // To avoid this, you should configure a second domain in the same way you
   // have the primary domain configured (e.g., point it at the same machine and
   // set up the same vhost rules) and provide it here. For instance, if your
   // primary install is on "http://www.phabricator-example.com/", you could
   // configure "http://www.phabricator-files.com/" and specify the entire
   // domain (with protocol) here. This will enforce that viewable files are
   // served only from the alternate domain. Ideally, you should use a completely
   // separate domain name rather than just a different subdomain.
   //
   // It is STRONGLY RECOMMENDED that you configure this. Phabricator makes this
   // attack difficult, but it is viable unless you isolate the file domain.
   'security.alternate-file-domain'  => null,
 
 // -- DarkConsole ----------------------------------------------------------- //
 
   // DarkConsole is a administrative debugging/profiling tool built into
   // Phabricator. You can leave it disabled unless you're developing against
   // Phabricator.
 
   // Determines whether or not DarkConsole is available. DarkConsole exposes
   // some data like queries and stack traces, so you should be careful about
   // turning it on in production (although users can not normally see it, even
   // if the deployment configuration enables it).
   'darkconsole.enabled'         => false,
 
   // Always enable DarkConsole, even for logged out users. This potentially
   // exposes sensitive information to users, so make sure untrusted users can
   // not access an install running in this mode. You should definitely leave
   // this off in production. It is only really useful for using DarkConsole
   // utilties to debug or profile logged-out pages. You must set
   // 'darkconsole.enabled' to use this option.
   'darkconsole.always-on'       => false,
 
 
   // Allows you to mask certain configuration values from appearing in the
   // "Config" tab of DarkConsole.
   'darkconsole.config-mask'     => array(
     'mysql.pass',
     'amazon-ses.secret-key',
     'recaptcha.private-key',
     'phabricator.csrf-key',
     'facebook.application-secret',
     'github.application-secret',
   ),
 
 
 // --  MySQL  --------------------------------------------------------------- //
 
   // The username to use when connecting to MySQL.
   'mysql.user' => 'root',
 
   // The password to use when connecting to MySQL.
   'mysql.pass' => '',
 
   // The MySQL server to connect to. If you want to connect to a different
   // port than the default (which is 3306), specify it in the hostname
   // (e.g., db.example.com:1234).
   'mysql.host' => 'localhost',
 
 
 // -- Email ----------------------------------------------------------------- //
 
   // Some Phabricator tools send email notifications, e.g. when Differential
   // revisions are updated or Maniphest tasks are changed. These options allow
   // you to configure how email is delivered.
 
   // You can test your mail setup by going to "MetaMTA" in the web interface,
   // clicking "Send New Message", and then composing a message.
 
   // Default address to send mail "From".
   'metamta.default-address'     => 'noreply@example.com',
 
   // Domain used to generate Message-IDs.
   'metamta.domain'              => 'example.com',
 
   // When a user takes an action which generates an email notification (like
   // commenting on a Differential revision), Phabricator can either send that
   // mail "From" the user's email address (like "alincoln@logcabin.com") or
   // "From" the 'metamta.default-address' address. The user experience is
   // generally better if Phabricator uses the user's real address as the "From"
   // since the messages are easier to organize when they appear in mail clients,
   // but this will only work if the server is authorized to send email on behalf
   // of the "From" domain. Practically, this means:
   //    - If you are doing an install for Example Corp and all the users will
   //      have corporate @corp.example.com addresses and any hosts Phabricator
   //      is running on are authorized to send email from corp.example.com,
   //      you can enable this to make the user experience a little better.
   //    - If you are doing an install for an open source project and your
   //      users will be registering via Facebook and using personal email
   //      addresses, you MUST NOT enable this or virtually all of your outgoing
   //      email will vanish into SFP blackholes.
   //    - If your install is anything else, you're much safer leaving this
   //      off since the risk in turning it on is that your outgoing mail will
   //      mostly never arrive.
   'metamta.can-send-as-user'    => false,
 
   // Adapter class to use to transmit mail to the MTA. The default uses
   // PHPMailerLite, which will invoke "sendmail". This is appropriate
   // if sendmail actually works on your host, but if you haven't configured mail
   // it may not be so great. You can also use Amazon SES, by changing this to
   // 'PhabricatorMailImplementationAmazonSESAdapter', signing up for SES, and
   // filling in your 'amazon-ses.access-key' and 'amazon-ses.secret-key' below.
   'metamta.mail-adapter'        =>
     'PhabricatorMailImplementationPHPMailerLiteAdapter',
 
   // When email is sent, try to hand it off to the MTA immediately. This may
   // be worth disabling if your MTA infrastructure is slow or unreliable. If you
   // disable this option, you must run the 'metamta_mta.php' daemon or mail
   // won't be handed off to the MTA. If you're using Amazon SES it can be a
   // little slugish sometimes so it may be worth disabling this and moving to
   // the daemon after you've got your install up and running. If you have a
   // properly configured local MTA it should not be necessary to disable this.
   'metamta.send-immediately'    => true,
 
   // If you're using Amazon SES to send email, provide your AWS access key
   // and AWS secret key here. To set up Amazon SES with Phabricator, you need
   // to:
   //  - Make sure 'metamta.mail-adapter' is set to:
   //    "PhabricatorMailImplementationAmazonSESAdapter"
   //  - Make sure 'metamta.can-send-as-user' is false.
   //  - Make sure 'metamta.default-address' is configured to something sensible.
   //  - Make sure 'metamta.default-address' is a validated SES "From" address.
   'amazon-ses.access-key'       =>  null,
   'amazon-ses.secret-key'       =>  null,
 
   // If you're using Sendgrid to send email, provide your access credentials
   // here. This will use the REST API. You can also use Sendgrid as a normal
   // SMTP service.
   'sendgrid.api-user'           => null,
   'sendgrid.api-key'            => null,
 
   // You can configure a reply handler domain so that email sent from Maniphest
   // will have a special "Reply To" address like "T123+82+af19f@example.com"
   // that allows recipients to reply by email and interact with tasks. For
   // instructions on configurating reply handlers, see the article
   // "Configuring Inbound Email" in the Phabricator documentation. By default,
   // this is set to 'null' and Phabricator will use a generic 'noreply@' address
   // or the address of the acting user instead of a special reply handler
   // address (see 'metamta.default-address'). If you set a domain here,
   // Phabricator will begin generating private reply handler addresses. See
   // also 'metamta.maniphest.reply-handler' to further configure behavior.
   // This key should be set to the domain part after the @, like "example.com".
   'metamta.maniphest.reply-handler-domain' => null,
 
   // You can follow the instructions in "Configuring Inbound Email" in the
   // Phabricator documentation and set 'metamta.maniphest.reply-handler-domain'
   // to support updating Maniphest tasks by email. If you want more advanced
   // customization than this provides, you can override the reply handler
   // class with an implementation of your own. This will allow you to do things
   // like have a single public reply handler or change how private reply
   // handlers are generated and validated.
   // This key should be set to a loadable subclass of
   // PhabricatorMailReplyHandler (and possibly of ManiphestReplyHandler).
   'metamta.maniphest.reply-handler' => 'ManiphestReplyHandler',
 
   // Prefix prepended to mail sent by Maniphest. You can change this to
   // distinguish between testing and development installs, for example.
   'metamta.maniphest.subject-prefix' => '[Maniphest]',
 
   // See 'metamta.maniphest.reply-handler-domain'. This does the same thing,
   // but allows email replies via Differential.
   'metamta.differential.reply-handler-domain' => null,
 
   // See 'metamta.maniphest.reply-handler'. This does the same thing, but
   // affects Differential.
   'metamta.differential.reply-handler' => 'DifferentialReplyHandler',
 
   // Prefix prepended to mail sent by Differential.
   'metamta.differential.subject-prefix' => '[Differential]',
 
   // By default, Phabricator generates unique reply-to addresses and sends a
   // separate email to each recipient when you enable reply handling. This is
   // more secure than using "From" to establish user identity, but can mean
   // users may receive multiple emails when they are on mailing lists. Instead,
   // you can use a single, non-unique reply to address and authenticate users
   // based on the "From" address by setting this to 'true'. This trades away
   // a little bit of security for convenience, but it's reasonable in many
   // installs. Object interactions are still protected using hashes in the
   // single public email address, so objects can not be replied to blindly.
   'metamta.public-replies' => false,
 
   // You can configure an email address like "bugs@phabricator.example.com"
   // which will automatically create Maniphest tasks when users send email
   // to it. This relies on the "From" address to authenticate users, so it is
   // is not completely secure. To set this up, enter a complete email
   // address like "bugs@phabricator.example.com" and then configure mail to
   // that address so it routed to Phabricator (if you've already configured
   // reply handlers, you're probably already done). See "Configuring Inbound
   // Email" in the documentation for more information.
   'metamta.maniphest.public-create-email' => null,
 
 
 // -- Auth ------------------------------------------------------------------ //
 
   // Can users login with a username/password, or by following the link from
   // a password reset email? You can disable this and configure one or more
   // OAuth providers instead.
   'auth.password-auth-enabled'  => true,
 
   // Maximum number of simultaneous web sessions each user is permitted to have.
   // Setting this to "1" will prevent a user from logging in on more than one
   // browser at the same time.
   'auth.sessions.web'           => 5,
 
   // Maximum number of simultaneous Conduit sessions each user is permitted
   // to have.
   'auth.sessions.conduit'       => 3,
 
   // Set this true to enable the Settings -> SSH Public Keys panel, which will
   // allow users to associated SSH public keys with their accounts. This is only
   // really useful if you're setting up services over SSH and want to use
   // Phabricator for authentication; in most situations you can leave this
   // disabled.
   'auth.sshkeys.enabled'        => false,
 
 
 // -- Accounts -------------------------------------------------------------- //
 
   // Is basic account information (email, real name, profile picture) editable?
   // If you set up Phabricator to automatically synchronize account information
   // from some other authoritative system, you can disable this to ensure
   // information remains consistent across both systems.
   'account.editable'            => true,
 
 
 // --  Facebook  ------------------------------------------------------------ //
 
   // Can users use Facebook credentials to login to Phabricator?
   'facebook.auth-enabled'       => false,
 
   // Can users use Facebook credentials to create new Phabricator accounts?
   'facebook.registration-enabled' => true,
 
   // Are Facebook accounts permanently linked to Phabricator accounts, or can
   // the user unlink them?
   'facebook.auth-permanent'     => false,
 
   // The Facebook "Application ID" to use for Facebook API access.
   'facebook.application-id'     => null,
 
   // The Facebook "Application Secret" to use for Facebook API access.
   'facebook.application-secret' => null,
 
 
 // -- Github ---------------------------------------------------------------- //
 
   // Can users use Github credentials to login to Phabricator?
   'github.auth-enabled'         => false,
 
   // Can users use Github credentials to create new Phabricator accounts?
   'github.registration-enabled' => true,
 
   // Are Github accounts permanently linked to Phabricator accounts, or can
   // the user unlink them?
   'github.auth-permanent'       => false,
 
   // The Github "Client ID" to use for Github API access.
   'github.application-id'       => null,
 
   // The Github "Secret" to use for Github API access.
   'github.application-secret'   => null,
 
 
 // -- Recaptcha ------------------------------------------------------------- //
 
   // Is Recaptcha enabled? If disabled, captchas will not appear.
   'recaptcha.enabled'           => false,
 
   // Your Recaptcha public key, obtained from Recaptcha.
   'recaptcha.public-key'        => null,
 
   // Your Recaptcha private key, obtained from Recaptcha.
   'recaptcha.private-key'       => null,
 
 
 // -- Misc ------------------------------------------------------------------ //
 
   // This is hashed with other inputs to generate CSRF tokens. If you want, you
   // can change it to some other string which is unique to your install. This
   // will make your install more secure in a vague, mostly theoretical way. But
   // it will take you like 3 seconds of mashing on your keyboard to set it up so
   // you might as well.
   'phabricator.csrf-key'        => '0b7ec0592e0a2829d8b71df2fa269b2c6172eca3',
 
   // This is hashed with other inputs to generate mail tokens. If you want, you
   // can change it to some other string which is unique to your install. In
   // particular, you will want to do this if you accidentally send a bunch of
   // mail somewhere you shouldn't have, to invalidate all old reply-to
   // addresses.
   'phabricator.mail-key'        => '5ce3e7e8787f6e40dfae861da315a5cdf1018f12',
 
 
   // This is hashed with other inputs to generate file secret keys. Changing
   // it will invalidate all file URIs if you have an alternate file domain
   // configured (see 'security.alternate-file-domain').
   'phabricator.file-key'        => 'ade8dadc8b4382067069a4d4798112191af8a190',
 
   // Version string displayed in the footer. You probably should leave this
   // alone.
   'phabricator.version'         => 'UNSTABLE',
 
   // PHP requires that you set a timezone in your php.ini before using date
   // functions, or it will emit a warning. If this isn't possible (for instance,
   // because you are using HPHP) you can set some valid constant for
   // date_default_timezone_set() here and Phabricator will set it on your
   // behalf, silencing the warning.
   'phabricator.timezone'        => null,
 
+  // When unhandled exceptions occur, stack traces are hidden by default.
+  // You can enable traces for development to make it easier to debug problems.
+  'phabricator.show-stack-traces' => false,
+
 
 // -- Files ----------------------------------------------------------------- //
 
   // Lists which uploaded file types may be viewed in the browser. If a file
   // has a mime type which does not appear in this list, it will always be
   // downloaded instead of displayed. This is a security consideration: if a
   // user uploads a file of type "text/html" and it is displayed as
   // "text/html", they can easily execute XSS attacks. This is also a usability
   // consideration, since browsers tend to freak out when viewing enormous
   // binary files.
   //
   // The keys in this array are viewable mime types; the values are the mime
   // types they will be delivered as when they are viewed in the browser.
   //
   // IMPORTANT: Making any file types viewable is a security vulnerability if
   // you do not configure 'security.alternate-file-domain' above.
   'files.viewable-mime-types' => array(
     'image/jpeg'  => 'image/jpeg',
     'image/jpg'   => 'image/jpg',
     'image/png'   => 'image/png',
     'image/gif'   => 'image/gif',
     'text/plain'  => 'text/plain; charset=utf-8',
   ),
 
   // Phabricator can proxy images from other servers so you can paste the URI
   // to a funny picture of a cat into the comment box and have it show up as an
   // image. However, this means the webserver Phabricator is running on will
   // make HTTP requests to arbitrary URIs. If the server has access to internal
   // resources, this could be a security risk. You should only enable it if you
   // are installed entirely a VPN and VPN access is required to access
   // Phabricator, or if the webserver has no special access to anything. If
   // unsure, it is safer to leave this disabled.
   'files.enable-proxy' => false,
 
 
 // -- Storage --------------------------------------------------------------- //
 
   // Phabricator allows users to upload files, and can keep them in various
   // storage engines. This section allows you to configure which engines
   // Phabricator will use, and how it will use them.
 
   // The largest filesize Phabricator will store in the MySQL BLOB storage
   // engine, which just uses a database table to store files. While this isn't a
   // best practice, it's really easy to set up. This is hard-limited by the
   // value of 'max_allowed_packet' in MySQL (since this often defaults to 1MB,
   // the default here is slightly smaller than 1MB). Set this to 0 to disable
   // use of the MySQL blob engine.
   'storage.mysql-engine.max-size' => 1000000,
 
   // Phabricator provides a local disk storage engine, which just writes files
   // to some directory on local disk. The webserver must have read/write
   // permissions on this directory. This is straightforward and suitable for
   // most installs, but will not scale past one web frontend unless the path
   // is actually an NFS mount, since you'll end up with some of the files
   // written to each web frontend and no way for them to share. To use the
   // local disk storage engine, specify the path to a directory here. To
   // disable it, specify null.
   'storage.local-disk.path'       => null,
 
   // If you want to store files in Amazon S3, specify an AWS access and secret
   // key here and a bucket name below.
   'amazon-s3.access-key'          =>  null,
   'amazon-s3.secret-key'          =>  null,
 
   // Set this to a valid Amazon S3 bucket to store files there. You must also
   // configure S3 access keys above.
   'storage.s3.bucket'             => null,
 
   // Phabricator uses a storage engine selector to choose which storage engine
   // to use when writing file data. If you add new storage engines or want to
   // provide very custom rules (e.g., write images to one storage engine and
   // other files to a different one), you can provide an alternate
   // implementation here. The default engine will use choose MySQL, Local Disk,
   // and S3, in that order, if they have valid configurations above and a file
   // fits within configured limits.
   'storage.engine-selector' => 'PhabricatorDefaultFileStorageEngineSelector',
 
 
 // -- Search ---------------------------------------------------------------- //
 
   // Phabricator uses a search engine selector to choose which search engine
   // to use when indexing and reconstructing documents, and when executing
   // queries. You can override the engine selector to provide a new selector
   // class which can select some custom engine you implement, if you want to
   // store your documents in some search engine which does not have default
   // support.
   'search.engine-selector'  => 'PhabricatorDefaultSearchEngineSelector',
 
 
 // -- Differential ---------------------------------------------------------- //
 
   'differential.revision-custom-detail-renderer'  => null,
 
   // Array for custom remarkup rules. The array should have a list of
   // class names of classes that extend PhutilRemarkupRule
   'differential.custom-remarkup-rules' => null,
 
   // Array for custom remarkup block rules. The array should have a list of
   // class names of classes that extend PhutilRemarkupEngineBlockRule
   'differential.custom-remarkup-block-rules' => null,
 
   // Set display word-wrap widths for Differential. Specify a dictionary of
   // regular expressions mapping to column widths. The filename will be matched
   // against each regexp in order until one matches. The default configuration
   // uses a width of 100 for Java and 80 for other languages. Note that 80 is
   // the greatest column width of all time. Changes here will not be immediately
   // reflected in old revisions unless you purge the render cache.
   'differential.wordwrap' => array(
     '/\.java$/' => 100,
     '/.*/'      => 80,
   ),
 
   // Class for appending custom fields to be included in the commit
   // messages generated by "arc amend".  Should inherit
   // DifferentialCommitMessageModifier
   'differential.modify-commit-message-class' => null,
 
   // List of file regexps were whitespace is meaningful and should not
   // use 'ignore-all' by default
   'differential.whitespace-matters' => array(
     '/\.py$/',
   ),
 
 
   'differential.field-selector' => 'DifferentialDefaultFieldSelector',
 
 
 // -- Maniphest ------------------------------------------------------------- //
 
   'maniphest.enabled' => true,
 
   // Array of custom fields for Maniphest tasks. For details on adding custom
   // fields to Maniphest, see "Maniphest User Guide: Adding Custom Fields".
   'maniphest.custom-fields' => array(),
 
   // Class which drives custom field construction. See "Maniphest User Guide:
   // Adding Custom Fields" in the documentation for more information.
   'maniphest.custom-task-extensions-class' => 'ManiphestDefaultTaskExtensions',
 
 // -- Remarkup -------------------------------------------------------------- //
 
   // If you enable this, linked YouTube videos will be embeded inline. This has
   // mild security implications (you'll leak referrers to YouTube) and is pretty
   // silly (but sort of awesome).
   'remarkup.enable-embedded-youtube' => false,
 
 
 // -- Garbage Collection ---------------------------------------------------- //
 
   // Phabricator generates various logs and caches in the database which can
   // be garbage collected after a while to make the total data size more
   // manageable. To run garbage collection, launch a
   // PhabricatorGarbageCollector daemon.
 
   // Since the GC daemon can issue large writes and table scans, you may want to
   // run it only during off hours or make sure it is scheduled so it doesn't
   // overlap with backups. This determines when the daemon can start running
   // each day.
   'gcdaemon.run-at'    => '12 AM',
 
   // How many seconds after 'gcdaemon.run-at' the daemon may collect garbage
   // for. By default it runs continuously, but you can set it to run for a
   // limited period of time. For instance, if you do backups at 3 AM, you might
   // run garbage collection for an hour beforehand. This is not a high-precision
   // limit so you may want to leave some room for the GC to actually stop, and
   // if you set it to something like 3 seconds you're on your own.
   'gcdaemon.run-for'   => 24 * 60 * 60,
 
   // These 'ttl' keys configure how much old data the GC daemon keeps around.
   // Objects older than the ttl will be collected. Set any value to 0 to store
   // data indefinitely.
 
   'gcdaemon.ttl.herald-transcripts'         => 30 * (24 * 60 * 60),
   'gcdaemon.ttl.daemon-logs'                =>  7 * (24 * 60 * 60),
   'gcdaemon.ttl.differential-parse-cache'   => 14 * (24 * 60 * 60),
 
 
 // -- Feed ------------------------------------------------------------------ //
 
   // If you set this to true, you can embed Phabricator activity feeds in other
   // pages using iframes. These feeds are completely public, and a login is not
   // required to view them! This is intended for things like open source
   // projects that want to expose an activity feed on the project homepage.
   'feed.public' => false,
 
 
 // -- Customization --------------------------------------------------------- //
 
   // Paths to additional phutil libraries to load.
   'load-libraries' => array(),
 
   'aphront.default-application-configuration-class' =>
     'AphrontDefaultApplicationConfiguration',
 
   'controller.oauth-registration' =>
     'PhabricatorOAuthDefaultRegistrationController',
 
 
   // Directory that phd (the Phabricator daemon control script) should use to
   // track running daemons.
   'phd.pid-directory' => '/var/tmp/phd',
 
   // This value is an input to the hash function when building resource hashes.
   // It has no security value, but if you accidentally poison user caches (by
   // pushing a bad patch or having something go wrong with a CDN, e.g.) you can
   // change this to something else and rebuild the Celerity map to break user
   // caches. Unless you are doing Celerity development, it is exceptionally
   // unlikely that you need to modify this.
   'celerity.resource-hash' => 'd9455ea150622ee044f7931dabfa52aa',
 
   // In a development environment, it is desirable to force static resources
   // (CSS and JS) to be read from disk on every request, so that edits to them
   // appear when you reload the page even if you haven't updated the resource
   // maps. This setting ensures requests will be verified against the state on
   // disk. Generally, you should leave this off in production (caching behavior
   // and performance improve with it off) but turn it on in development. (These
   // settings are the defaults.)
   'celerity.force-disk-reads' => false,
 
   // -- Pygments ------------------------------------------------------------ //
   // Phabricator can highlight PHP by default, but if you want syntax
   // highlighting for other languages you should install the python package
   // 'Pygments', make sure the 'pygmentize' script is available in the
   // $PATH of the webserver, and then enable this.
   'pygments.enabled'            => false,
 
   // In places that we display a dropdown to syntax-highlight code,
   // this is where that list is defined.
   // Syntax is 'lexer-name' => 'Display Name',
   'pygments.dropdown-choices' => array(
     'apacheconf' => 'Apache Configuration',
     'bash' => 'Bash Scripting',
     'brainfuck' => 'Brainf*ck',
     'c' => 'C',
     'cpp' => 'C++',
     'css' => 'CSS',
     'diff' => 'Diff',
     'django' => 'Django Templating',
     'erb' => 'Embedded Ruby/ERB',
     'erlang' => 'Erlang',
     'html' => 'HTML',
     'infer' => 'Infer from title (extension)',
     'java' => 'Java',
     'js' => 'Javascript',
     'mysql' => 'MySQL',
     'perl' => 'Perl',
     'php' => 'PHP',
     'text' => 'Plain Text',
     'python' => 'Python',
     'rainbow' => 'Rainbow',
     'remarkup' => 'Remarkup',
     'ruby' => 'Ruby',
     'xml' => 'XML',
   ),
 
   'pygments.dropdown-default' => 'infer',
 
   // This is an override list of regular expressions which allows you to choose
   // what language files are highlighted as. If your projects have certain rules
   // about filenames or use unusual or ambiguous language extensions, you can
   // create a mapping here. This is an ordered dictionary of regular expressions
   // which will be tested against the filename. They should map to either an
   // explicit language as a string value, or a numeric index into the captured
   // groups as an integer.
   'syntax.filemap' => array(
     // Example: Treat all '*.xyz' files as PHP.
     // '@\\.xyz$@' => 'php',
 
     // Example: Treat 'httpd.conf' as 'apacheconf'.
     // '@/httpd\\.conf$@' => 'apacheconf',
 
     // Example: Treat all '*.x.bak' file as '.x'. NOTE: we map to capturing
     // group 1 by specifying the mapping as "1".
     // '@\\.([^.]+)\\.bak$@' => 1,
   ),
 
 );
diff --git a/conf/development.conf.php b/conf/development.conf.php
index 3e2e8d0b55..34edf822a1 100644
--- a/conf/development.conf.php
+++ b/conf/development.conf.php
@@ -1,24 +1,25 @@
 <?php
 
 /*
  * Copyright 2011 Facebook, Inc.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *   http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
 
 return array(
 
-  'darkconsole.enabled' => true,
-  'celerity.force-disk-reads' => true,
+  'darkconsole.enabled'           => true,
+  'celerity.force-disk-reads'     => true,
+  'phabricator.show-stack-traces' => true,
 
 ) + phabricator_read_config_file('default');
diff --git a/src/aphront/default/configuration/AphrontDefaultApplicationConfiguration.php b/src/aphront/default/configuration/AphrontDefaultApplicationConfiguration.php
index 29e16336d6..d4fa8f9dd1 100644
--- a/src/aphront/default/configuration/AphrontDefaultApplicationConfiguration.php
+++ b/src/aphront/default/configuration/AphrontDefaultApplicationConfiguration.php
@@ -1,483 +1,577 @@
 <?php
 
 /*
  * Copyright 2011 Facebook, Inc.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *   http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
 
 /**
  * @group aphront
  */
 class AphrontDefaultApplicationConfiguration
   extends AphrontApplicationConfiguration {
 
   public function __construct() {
 
   }
 
   public function getApplicationName() {
     return 'aphront-default';
   }
 
   public function getURIMap() {
     return $this->getResourceURIMapRules() + array(
       '/' => array(
         '$'                     => 'PhabricatorDirectoryMainController',
       ),
       '/directory/' => array(
         'item/$'
           => 'PhabricatorDirectoryItemListController',
         'item/edit/(?:(?P<id>\d+)/)?$'
           => 'PhabricatorDirectoryItemEditController',
         'item/delete/(?P<id>\d+)/'
           => 'PhabricatorDirectoryItemDeleteController',
         'category/$'
           => 'PhabricatorDirectoryCategoryListController',
         'category/edit/(?:(?P<id>\d+)/)?$'
           => 'PhabricatorDirectoryCategoryEditController',
         'category/delete/(?P<id>\d+)/'
           => 'PhabricatorDirectoryCategoryDeleteController',
       ),
       '/file/' => array(
         '$' => 'PhabricatorFileListController',
         'upload/$' => 'PhabricatorFileUploadController',
         'dropupload/$' => 'PhabricatorFileDropUploadController',
         '(?P<view>info)/(?P<phid>[^/]+)/' => 'PhabricatorFileViewController',
         '(?P<view>view)/(?P<phid>[^/]+)/' => 'PhabricatorFileViewController',
         '(?P<view>download)/(?P<phid>[^/]+)/' => 'PhabricatorFileViewController',
         'alt/(?P<key>[^/]+)/(?P<phid>[^/]+)/'
           => 'PhabricatorFileAltViewController',
         'macro/' => array(
           '$' => 'PhabricatorFileMacroListController',
           'edit/(?:(?P<id>\d+)/)?$' => 'PhabricatorFileMacroEditController',
           'delete/(?P<id>\d+)/$' => 'PhabricatorFileMacroDeleteController',
         ),
         'proxy/$' => 'PhabricatorFileProxyController',
         'xform/(?P<transform>[^/]+)/(?P<phid>[^/]+)/'
           => 'PhabricatorFileTransformController',
       ),
       '/phid/' => array(
         '$' => 'PhabricatorPHIDLookupController',
         'list/$' => 'PhabricatorPHIDListController',
       ),
       '/people/' => array(
         '$' => 'PhabricatorPeopleListController',
         'logs/$' => 'PhabricatorPeopleLogsController',
         'edit/(?:(?P<id>\d+)/(?:(?P<view>\w+)/)?)?$'
           => 'PhabricatorPeopleEditController',
       ),
       '/p/(?P<username>\w+)/(?:(?P<page>\w+)/)?$'
         => 'PhabricatorPeopleProfileController',
       '/conduit/' => array(
         '$' => 'PhabricatorConduitConsoleController',
         'method/(?P<method>[^/]+)$' => 'PhabricatorConduitConsoleController',
         'log/$' => 'PhabricatorConduitLogController',
         'token/$' => 'PhabricatorConduitTokenController',
       ),
       '/api/(?P<method>[^/]+)$' => 'PhabricatorConduitAPIController',
 
       '/D(?P<id>\d+)' => 'DifferentialRevisionViewController',
       '/differential/' => array(
         '$' => 'DifferentialRevisionListController',
         'filter/(?P<filter>\w+)/$' => 'DifferentialRevisionListController',
         'diff/' => array(
           '(?P<id>\d+)/$' => 'DifferentialDiffViewController',
           'create/$' => 'DifferentialDiffCreateController',
         ),
         'changeset/$'  => 'DifferentialChangesetViewController',
         'revision/edit/(?:(?P<id>\d+)/)?$'
           => 'DifferentialRevisionEditController',
         'comment/' => array(
           'preview/(?P<id>\d+)/$' => 'DifferentialCommentPreviewController',
           'save/$' => 'DifferentialCommentSaveController',
           'inline/' => array(
             'preview/(?P<id>\d+)/$' =>
               'DifferentialInlineCommentPreviewController',
             'edit/(?P<id>\d+)/$' => 'DifferentialInlineCommentEditController',
           ),
         ),
         'subscribe/(?P<action>add|rem)/(?P<id>\d+)/$'
           => 'DifferentialSubscribeController',
       ),
 
       '/typeahead/' => array(
         'common/(?P<type>\w+)/$'
           => 'PhabricatorTypeaheadCommonDatasourceController',
       ),
 
       '/mail/' => array(
         '$' => 'PhabricatorMetaMTAListController',
         'send/$' => 'PhabricatorMetaMTASendController',
         'view/(?P<id>\d+)/$' => 'PhabricatorMetaMTAViewController',
         'lists/$' => 'PhabricatorMetaMTAMailingListsController',
         'lists/edit/(?:(?P<id>\d+)/)?$'
           => 'PhabricatorMetaMTAMailingListEditController',
         'receive/$' => 'PhabricatorMetaMTAReceiveController',
         'received/$' => 'PhabricatorMetaMTAReceivedListController',
         'sendgrid/$' => 'PhabricatorMetaMTASendGridReceiveController',
       ),
 
       '/login/' => array(
         '$' => 'PhabricatorLoginController',
         'email/$' => 'PhabricatorEmailLoginController',
         'etoken/(?P<token>\w+)/$' => 'PhabricatorEmailTokenController',
         'refresh/$' => 'PhabricatorRefreshCSRFController',
       ),
 
       '/logout/$' => 'PhabricatorLogoutController',
 
       '/oauth/' => array(
         '(?P<provider>github|facebook)/' => array(
           'login/$'     => 'PhabricatorOAuthLoginController',
           'diagnose/$'  => 'PhabricatorOAuthDiagnosticsController',
           'unlink/$'    => 'PhabricatorOAuthUnlinkController',
         ),
       ),
 
       '/xhprof/' => array(
         'profile/(?P<phid>[^/]+)/$' => 'PhabricatorXHProfProfileController',
       ),
 
       '/~/' => 'DarkConsoleController',
 
       '/settings/' => array(
         '(?:page/(?P<page>[^/]+)/)?$' => 'PhabricatorUserSettingsController',
       ),
 
       '/maniphest/' => array(
         '$' => 'ManiphestTaskListController',
         'view/(?P<view>\w+)/$' => 'ManiphestTaskListController',
         'task/' => array(
           'create/$' => 'ManiphestTaskEditController',
           'edit/(?P<id>\d+)/$' => 'ManiphestTaskEditController',
           'descriptionchange/(?P<id>\d+)/$' =>
             'ManiphestTaskDescriptionChangeController',
         ),
         'transaction/' => array(
           'save/' => 'ManiphestTransactionSaveController',
           'preview/(?P<id>\d+)/$' => 'ManiphestTransactionPreviewController',
         ),
       ),
 
       '/T(?P<id>\d+)$' => 'ManiphestTaskDetailController',
 
       '/github-post-receive/(?P<id>\d+)/(?P<token>[^/]+)/$'
         => 'PhabricatorRepositoryGitHubPostReceiveController',
 
       '/repository/' => array(
         '$'                     => 'PhabricatorRepositoryListController',
         'create/$'              => 'PhabricatorRepositoryCreateController',
         'edit/(?P<id>\d+)/(?:(?P<view>\w+)?/)?$' =>
           'PhabricatorRepositoryEditController',
         'delete/(?P<id>\d+)/$'  => 'PhabricatorRepositoryDeleteController',
         'project/(?P<id>\d+)/' =>
           'PhabricatorRepositoryArcanistProjectEditController',
       ),
 
       '/search/' => array(
         '$' => 'PhabricatorSearchController',
         '(?P<id>\d+)/$' => 'PhabricatorSearchController',
         'attach/(?P<phid>[^/]+)/(?P<type>\w+)/(?:(?P<action>\w+)/)?$'
           => 'PhabricatorSearchAttachController',
         'select/(?P<type>\w+)/$'
           => 'PhabricatorSearchSelectController',
         'index/(?P<phid>[^/]+)/$' => 'PhabricatorSearchIndexController',
       ),
 
       '/project/' => array(
         '$' => 'PhabricatorProjectListController',
         'edit/(?P<id>\d+)/$' => 'PhabricatorProjectProfileEditController',
         'view/(?P<id>\d+)/(?:(?P<page>\w+)/)?$'
           => 'PhabricatorProjectProfileController',
         'affiliation/(?P<id>\d+)/$'
           => 'PhabricatorProjectAffiliationEditController',
         'create/$' => 'PhabricatorProjectCreateController',
       ),
 
       '/r(?P<callsign>[A-Z]+)(?P<commit>[a-z0-9]+)$'
         => 'DiffusionCommitController',
       '/diffusion/' => array(
         '$' => 'DiffusionHomeController',
         '(?P<callsign>[A-Z]+)/' => array(
           '$' => 'DiffusionRepositoryController',
           'repository/'.
             '(?P<path>[^/]+)/'.
             '$'
               => 'DiffusionRepositoryController',
           'change/'.
             '(?P<path>.*?)'.
             '(?:[;](?P<commit>[a-z0-9]+))?'.
             '$'
               => 'DiffusionChangeController',
           'history/'.
             '(?P<path>.*?)'.
             '(?:[;](?P<commit>[a-z0-9]+))?'.
             '$'
               => 'DiffusionHistoryController',
           'browse/'.
             '(?P<path>.*?)'.
             '(?:[;](?P<commit>[a-z0-9]+))?'.
             '(?:[$](?P<line>\d+))?'.
             '$'
               => 'DiffusionBrowseController',
           'diff/'.
             '(?P<path>.*?)'.
             '(?:[;](?P<commit>[a-z0-9]+))?'.
             '$'
               => 'DiffusionDiffController',
           'lastmodified/'.
             '(?P<path>.*?)'.
             '(?:[;](?P<commit>[a-z0-9]+))?'.
             '$'
               => 'DiffusionLastModifiedController',
         ),
         'services/' => array(
           'path/' => array(
             'complete/$' => 'DiffusionPathCompleteController',
             'validate/$' => 'DiffusionPathValidateController',
           ),
         ),
         'author/' => array(
           '$' => 'DiffusionCommitListController',
           '(?P<username>\w+)/$' => 'DiffusionCommitListController',
         ),
       ),
 
       '/daemon/' => array(
         'task/(?P<id>\d+)/$' => 'PhabricatorWorkerTaskDetailController',
         'log/' => array(
           '$' => 'PhabricatorDaemonLogListController',
           'combined/$' => 'PhabricatorDaemonCombinedLogController',
           '(?P<id>\d+)/$' => 'PhabricatorDaemonLogViewController',
         ),
         'timeline/$' => 'PhabricatorDaemonTimelineConsoleController',
         'timeline/(?P<id>\d+)/$' => 'PhabricatorDaemonTimelineEventController',
         '$' => 'PhabricatorDaemonConsoleController',
       ),
 
       '/herald/' => array(
         '$' => 'HeraldHomeController',
         'view/(?P<view>[^/]+)/$' => 'HeraldHomeController',
         'new/(?:(?P<type>[^/]+)/)?$' => 'HeraldNewController',
         'rule/(?:(?P<id>\d+)/)?$' => 'HeraldRuleController',
         'delete/(?P<id>\d+)/$' => 'HeraldDeleteController',
         'test/$' => 'HeraldTestConsoleController',
         'transcript/$' => 'HeraldTranscriptListController',
         'transcript/(?P<id>\d+)/(?:(?P<filter>\w+)/)?$'
           => 'HeraldTranscriptController',
       ),
 
       '/uiexample/' => array(
         '$' => 'PhabricatorUIExampleRenderController',
         'view/(?P<class>[^/]+)/$' => 'PhabricatorUIExampleRenderController',
       ),
 
       '/owners/' => array(
         '$' => 'PhabricatorOwnersListController',
         'view/(?P<view>[^/]+)/$' => 'PhabricatorOwnersListController',
         'edit/(?P<id>\d+)/$' => 'PhabricatorOwnersEditController',
         'new/$' => 'PhabricatorOwnersEditController',
         'package/(?P<id>\d+)/$' => 'PhabricatorOwnersDetailController',
         'delete/(?P<id>\d+)/$' => 'PhabricatorOwnersDeleteController',
       ),
 
       '/xhpast/' => array(
         '$' => 'PhabricatorXHPASTViewRunController',
         'view/(?P<id>\d+)/$'
           => 'PhabricatorXHPASTViewFrameController',
         'frameset/(?P<id>\d+)/$'
           => 'PhabricatorXHPASTViewFramesetController',
         'input/(?P<id>\d+)/$'
           => 'PhabricatorXHPASTViewInputController',
         'tree/(?P<id>\d+)/$'
           => 'PhabricatorXHPASTViewTreeController',
         'stream/(?P<id>\d+)/$'
           => 'PhabricatorXHPASTViewStreamController',
       ),
 
       '/status/$' => 'PhabricatorStatusController',
 
       '/paste/' => array(
         '$' => 'PhabricatorPasteCreateController',
         'list/' => 'PhabricatorPasteListController',
       ),
 
       '/P(?P<id>\d+)$' => 'PhabricatorPasteViewController',
 
       '/help/' => array(
         'keyboardshortcut/$' => 'PhabricatorHelpKeyboardShortcutController',
       ),
 
       '/countdown/' => array(
         '$'
           => 'PhabricatorCountdownListController',
         '(?P<id>\d+)/$'
           => 'PhabricatorCountdownViewController',
         'edit/(?:(?P<id>\d+)/)?$'
           => 'PhabricatorCountdownEditController',
         'delete/(?P<id>\d+)/$'
           => 'PhabricatorCountdownDeleteController'
       ),
 
       '/feed/' => array(
         '$' => 'PhabricatorFeedStreamController',
         'public/$' => 'PhabricatorFeedPublicStreamController',
       ),
 
       '/V(?P<id>\d+)$'  => 'PhabricatorSlowvotePollController',
       '/vote/' => array(
         '(?:view/(?P<view>\w+)/)?$' => 'PhabricatorSlowvoteListController',
         'create/'   => 'PhabricatorSlowvoteCreateController',
       ),
 
       // Match "/w/" with slug "/".
       '/w(?P<slug>/)$'    => 'PhrictionDocumentController',
       // Match "/w/x/y/z/" with slug "x/y/z/".
       '/w/(?P<slug>.+/)$' => 'PhrictionDocumentController',
 
       '/phriction/' => array(
         '$'                       => 'PhrictionListController',
         'list/(?P<view>[^/]+)/$'  => 'PhrictionListController',
 
         'history(?P<slug>/)$'     => 'PhrictionHistoryController',
         'history/(?P<slug>.+/)$'  => 'PhrictionHistoryController',
 
         'edit/(?:(?P<id>\d+)/)?$' => 'PhrictionEditController',
 
         'preview/$' => 'PhrictionDocumentPreviewController',
         'diff/(?P<id>\d+)/$' => 'PhrictionDiffController',
       ),
 
       '/calendar/' => array(
         '$' => 'PhabricatorCalendarBrowseController',
       ),
     );
   }
 
   protected function getResourceURIMapRules() {
     return array(
       '/res/' => array(
         '(?P<package>pkg/)?(?P<hash>[a-f0-9]{8})/(?P<path>.+\.(?:css|js))$'
           => 'CelerityResourceController',
       ),
     );
   }
 
   public function buildRequest() {
     $request = new AphrontRequest($this->getHost(), $this->getPath());
     $request->setRequestData($_GET + $_POST);
     $request->setApplicationConfiguration($this);
     return $request;
   }
 
   public function handleException(Exception $ex) {
 
     // Always log the unhandled exception.
     phlog($ex);
 
     $class    = phutil_escape_html(get_class($ex));
     $message  = phutil_escape_html($ex->getMessage());
 
-    $string = (string)$ex;
-    $string = phutil_escape_html($string);
-    $string = str_replace("\n", '<br />', $string);
+    if (PhabricatorEnv::getEnvConfig('phabricator.show-stack-traces')) {
+      $trace = $this->renderStackTrace($ex->getTrace());
+    } else {
+      $trace = null;
+    }
 
     $content =
       '<div class="aphront-unhandled-exception">'.
-        '<h1>Unhandled Exception "'.$class.'": '.$message.'</h1>'.
-        '<code>'.$string.'</code>'.
+        '<div class="exception-message">'.$message.'</div>'.
+        $trace.
       '</div>';
 
     $user = $this->getRequest()->getUser();
     if (!$user) {
       // If we hit an exception very early, we won't have a user.
       $user = new PhabricatorUser();
     }
 
     $dialog = new AphrontDialogView();
     $dialog
-      ->setTitle('Exception!')
+      ->setTitle('Unhandled Exception ("'.$class.'")')
       ->setClass('aphront-exception-dialog')
       ->setUser($user)
-      ->appendChild($content)
-      ->addCancelButton('/');
+      ->appendChild($content);
+
+    if ($this->getRequest()->isAjax()) {
+      $dialog->addCancelButton('/', 'Close');
+    }
 
     $response = new AphrontDialogResponse();
     $response->setDialog($dialog);
 
     return $response;
   }
 
   public function willSendResponse(AphrontResponse $response) {
     $request = $this->getRequest();
     $response->setRequest($request);
     if ($response instanceof AphrontDialogResponse) {
       if (!$request->isAjax()) {
         $view = new PhabricatorStandardPageView();
         $view->setRequest($request);
         $view->appendChild(
           '<div style="padding: 2em 0;">'.
             $response->buildResponseString().
           '</div>');
         $response = new AphrontWebpageResponse();
         $response->setContent($view->render());
         return $response;
       } else {
         return id(new AphrontAjaxResponse())
           ->setContent(array(
             'dialog' => $response->buildResponseString(),
           ));
       }
     } else if ($response instanceof AphrontRedirectResponse) {
       if ($request->isAjax()) {
         return id(new AphrontAjaxResponse())
           ->setContent(
             array(
               'redirect' => $response->getURI(),
             ));
       }
     } else if ($response instanceof Aphront404Response) {
 
       $failure = new AphrontRequestFailureView();
       $failure->setHeader('404 Not Found');
       $failure->appendChild(
         '<p>The page you requested was not found.</p>');
 
       $view = new PhabricatorStandardPageView();
       $view->setTitle('404 Not Found');
       $view->setRequest($this->getRequest());
       $view->appendChild($failure);
 
       $response = new AphrontWebpageResponse();
       $response->setContent($view->render());
       $response->setHTTPResponseCode(404);
       return $response;
     }
 
     return $response;
   }
 
   public function build404Controller() {
     return array(new Phabricator404Controller($this->getRequest()), array());
   }
 
   public function buildRedirectController($uri) {
     return array(
       new PhabricatorRedirectController($this->getRequest()),
       array(
         'uri' => $uri,
       ));
   }
 
+  private function renderStackTrace($trace) {
+
+    $libraries = PhutilBootloader::getInstance()->getAllLibraries();
+
+    // TODO: Make this configurable?
+    $host = 'https://secure.phabricator.com';
+
+    $browse = array(
+      'arcanist' =>
+        $host.'/diffusion/ARC/browse/origin:master/src/',
+      'phutil' =>
+        $host.'/diffusion/PHU/browse/origin:master/src/',
+      'phabricator' =>
+        $host.'/diffusion/P/browse/origin:master/src/',
+    );
+
+    $rows = array();
+    $depth = count($trace);
+    foreach ($trace as $part) {
+      $lib = null;
+      $file = $part['file'];
+      $relative = $file;
+      foreach ($libraries as $library) {
+        $root = phutil_get_library_root($library);
+        if (Filesystem::isDescendant($file, $root)) {
+          $lib = $library;
+          $relative = Filesystem::readablePath($file, $root);
+          break;
+        }
+      }
+
+      $where = '';
+      if (isset($part['class'])) {
+        $where .= $part['class'].'::';
+      }
+      if (isset($part['function'])) {
+        $where .= $part['function'].'()';
+      }
+
+      if (isset($browse[$lib])) {
+        $file_name = phutil_render_tag(
+          'a',
+          array(
+            'href' => $browse[$lib].$relative.'$'.$part['line'],
+            'title' => $file,
+            'target' => '_blank',
+          ),
+          phutil_escape_html($relative));
+      } else {
+        $file_name = phutil_render_tag(
+          'span',
+          array(
+            'title' => $file,
+          ),
+          phutil_escape_html($relative));
+      }
+      $file_name = $file_name.' : '.(int)$part['line'];
+
+
+      $rows[] = array(
+        $depth--,
+        phutil_escape_html($lib),
+        $file_name,
+        phutil_escape_html($where),
+      );
+    }
+    $table = new AphrontTableView($rows);
+    $table->setHeaders(
+      array(
+        'Depth',
+        'Library',
+        'File',
+        'Where',
+      ));
+    $table->setColumnClasses(
+      array(
+        'n',
+        '',
+        '',
+        'wide',
+      ));
+
+    return
+      '<div class="exception-trace">'.
+        '<div class="exception-trace-header">Stack Trace</div>'.
+        $table->render().
+      '</div>';
+  }
+
 }
diff --git a/src/aphront/default/configuration/__init__.php b/src/aphront/default/configuration/__init__.php
index 46cf91a597..9e2f375d92 100644
--- a/src/aphront/default/configuration/__init__.php
+++ b/src/aphront/default/configuration/__init__.php
@@ -1,26 +1,30 @@
 <?php
 /**
  * This file is automatically generated. Lint this module to rebuild it.
  * @generated
  */
 
 
 
 phutil_require_module('phabricator', 'aphront/applicationconfiguration');
 phutil_require_module('phabricator', 'aphront/request');
 phutil_require_module('phabricator', 'aphront/response/ajax');
 phutil_require_module('phabricator', 'aphront/response/dialog');
 phutil_require_module('phabricator', 'aphront/response/webpage');
 phutil_require_module('phabricator', 'applications/base/controller/404');
 phutil_require_module('phabricator', 'applications/base/controller/redirect');
 phutil_require_module('phabricator', 'applications/people/storage/user');
+phutil_require_module('phabricator', 'infrastructure/env');
+phutil_require_module('phabricator', 'view/control/table');
 phutil_require_module('phabricator', 'view/dialog');
 phutil_require_module('phabricator', 'view/page/failure');
 phutil_require_module('phabricator', 'view/page/standard');
 
 phutil_require_module('phutil', 'error');
+phutil_require_module('phutil', 'filesystem');
 phutil_require_module('phutil', 'markup');
+phutil_require_module('phutil', 'moduleutils');
 phutil_require_module('phutil', 'utils');
 
 
 phutil_require_source('AphrontDefaultApplicationConfiguration.php');
diff --git a/webroot/rsrc/css/aphront/dialog-view.css b/webroot/rsrc/css/aphront/dialog-view.css
index 48488127b4..142cbb7512 100644
--- a/webroot/rsrc/css/aphront/dialog-view.css
+++ b/webroot/rsrc/css/aphront/dialog-view.css
@@ -1,71 +1,90 @@
 /**
  * @provides aphront-dialog-view-css
  */
 
 .aphront-dialog-view {
   width: 480px;
   padding: 8px;
   background: #666;
   margin: auto;
 }
 
 .aphront-dialog-head {
   background:   #003366;
   border:       none;
   font-size:    15px;
   padding:      5px 12px 6px;
   color:        #ffffff;
 }
 
 .aphront-dialog-view-width-form {
   width:        600px;
 }
 
 .aphront-dialog-body {
   background: #ffffff;
   padding: 16px 12px;
   border: none;
   overflow: hidden;
 }
 
 .aphront-dialog-tail {
   border: none;
   background: #ededed;
   padding: 0.5em;
   text-align: right;
 }
 
 .aphront-dialog-tail button,
 .aphront-dialog-tail a.button {
   float: right;
   margin-left: .5em;
 }
 
 .jx-client-dialog {
   position:   absolute;
   z-index:    6;
 }
 
 .jx-mask {
   opacity:    .37;
   -ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=37)";
   filter:     alpha(opacity=37);
   background: #222;
   position:   absolute;
   z-index:    5;
   top:        0;
   left:       0;
   right:      0;
   bottom:     0;
   width:      100%;
   height:     100%;
   min-height: 100%;
 }
 
 .aphront-exception-dialog {
   width: 95%;
 }
 
 .aphront-exception-dialog .aphront-dialog-head {
   background: #aa0000;
 }
+
+.aphront-exception-dialog .exception-message {
+  font-size: 14px;
+  background: #efefef;
+  padding: 1em;
+}
+
+.aphront-exception-dialog .exception-trace {
+  margin-top: 1em;
+  padding: .5em 1em;
+}
+
+.aphront-exception-dialog .exception-trace-header {
+  font-size: 11px;
+  color: #666666;
+  border-bottom: 1px solid #aaaaaa;
+  padding-bottom: .5em;
+  margin-bottom: .5em;
+}