diff --git a/resources/celerity/map.php b/resources/celerity/map.php
--- a/resources/celerity/map.php
+++ b/resources/celerity/map.php
@@ -9,7 +9,7 @@
   'names' => array(
     'conpherence.pkg.css' => 'e68cf1fa',
     'conpherence.pkg.js' => '15191c65',
-    'core.pkg.css' => '2574c199',
+    'core.pkg.css' => 'cff4ff6f',
     'core.pkg.js' => 'b5a949ca',
     'differential.pkg.css' => '06dc617c',
     'differential.pkg.js' => 'c1cfa143',
@@ -32,7 +32,7 @@
     'rsrc/css/aphront/phabricator-nav-view.css' => '694d7723',
     'rsrc/css/aphront/table-view.css' => '8c9bbafe',
     'rsrc/css/aphront/tokenizer.css' => '15d5ff71',
-    'rsrc/css/aphront/tooltip.css' => '173b9431',
+    'rsrc/css/aphront/tooltip.css' => 'cb1397a4',
     'rsrc/css/aphront/typeahead-browse.css' => 'f2818435',
     'rsrc/css/aphront/typeahead.css' => 'a4a21016',
     'rsrc/css/application/almanac/almanac.css' => 'dbb9b3af',
@@ -521,7 +521,7 @@
     'aphront-panel-view-css' => '8427b78d',
     'aphront-table-view-css' => '8c9bbafe',
     'aphront-tokenizer-control-css' => '15d5ff71',
-    'aphront-tooltip-css' => '173b9431',
+    'aphront-tooltip-css' => 'cb1397a4',
     'aphront-typeahead-control-css' => 'a4a21016',
     'application-search-view-css' => '787f5b76',
     'auth-css' => '0877ed6e',
diff --git a/webroot/rsrc/css/aphront/tooltip.css b/webroot/rsrc/css/aphront/tooltip.css
--- a/webroot/rsrc/css/aphront/tooltip.css
+++ b/webroot/rsrc/css/aphront/tooltip.css
@@ -5,6 +5,12 @@
 .jx-tooltip-container {
   position: absolute;
   padding: 5px;
+
+  /* In Chrome, moving the cursor into the empty space next to the "caret" on
+     the caret side of the tooltip can cause the tooltip to flicker rapidly
+     because the cursor hits the container. To stop this, prevent cursor
+     events on the container. See T8440. */
+  pointer-events: none;
 }
 
 .jx-tooltip-appear {