diff --git a/resources/celerity/map.php b/resources/celerity/map.php
index 584b771d52..5281f1c832 100644
--- a/resources/celerity/map.php
+++ b/resources/celerity/map.php
@@ -9,7 +9,7 @@ return array(
   'names' => array(
     'conpherence.pkg.css' => '3c8a0668',
     'conpherence.pkg.js' => '020aebcf',
-    'core.pkg.css' => '7ef29af5',
+    'core.pkg.css' => '86f155f9',
     'core.pkg.js' => '705aec2c',
     'differential.pkg.css' => '607c84be',
     'differential.pkg.js' => '1b97518d',
@@ -37,7 +37,7 @@ return array(
     'rsrc/css/aphront/typeahead.css' => '8779483d',
     'rsrc/css/application/almanac/almanac.css' => '2e050f4f',
     'rsrc/css/application/auth/auth.css' => 'c2f23d74',
-    'rsrc/css/application/base/main-menu-view.css' => '17b71bbc',
+    'rsrc/css/application/base/main-menu-view.css' => 'bcec20f0',
     'rsrc/css/application/base/notification-menu.css' => '4df1ee30',
     'rsrc/css/application/base/phui-theme.css' => '35883b37',
     'rsrc/css/application/base/standard-page-view.css' => '8a295cb9',
@@ -787,7 +787,7 @@ return array(
     'phabricator-flag-css' => '2b77be8d',
     'phabricator-keyboard-shortcut' => 'c9749dcd',
     'phabricator-keyboard-shortcut-manager' => '37b8a04a',
-    'phabricator-main-menu-view' => '17b71bbc',
+    'phabricator-main-menu-view' => 'bcec20f0',
     'phabricator-nav-view-css' => 'f8a0c1bf',
     'phabricator-notification' => 'a9b91e3f',
     'phabricator-notification-css' => '30240bd2',
@@ -1033,9 +1033,6 @@ return array(
       'javelin-stratcom',
       'javelin-util',
     ),
-    '17b71bbc' => array(
-      'phui-theme-css',
-    ),
     '1b6acc2a' => array(
       'javelin-magical-init',
       'javelin-util',
@@ -1990,6 +1987,9 @@ return array(
       'phabricator-drag-and-drop-file-upload',
       'javelin-workboard-board',
     ),
+    'bcec20f0' => array(
+      'phui-theme-css',
+    ),
     'c03f2fb4' => array(
       'javelin-install',
     ),
diff --git a/webroot/rsrc/css/application/base/main-menu-view.css b/webroot/rsrc/css/application/base/main-menu-view.css
index 944b0af125..66f81da0bc 100644
--- a/webroot/rsrc/css/application/base/main-menu-view.css
+++ b/webroot/rsrc/css/application/base/main-menu-view.css
@@ -369,6 +369,10 @@ a.phabricator-core-user-menu .caret:before {
 .device-desktop .alert-notifications:hover {
   margin-top: -2px;
   transition-duration: .2s;
+
+  /* See T13508. Avoid animation flickering behavior if the user's cursor is
+     at the very bottom of the element. */
+  padding-bottom: 2px;
 }
 
 .device-desktop .alert-notifications:hover .phui-icon-view {