diff --git a/resources/celerity/map.php b/resources/celerity/map.php
--- a/resources/celerity/map.php
+++ b/resources/celerity/map.php
@@ -356,10 +356,10 @@
     'rsrc/js/application/config/behavior-reorder-fields.js' => '14a827de',
     'rsrc/js/application/conpherence/ConpherenceThreadManager.js' => '0a5192c4',
     'rsrc/js/application/conpherence/behavior-durable-column.js' => '7ffa744f',
-    'rsrc/js/application/conpherence/behavior-menu.js' => 'e67cfd8c',
+    'rsrc/js/application/conpherence/behavior-menu.js' => 'eaf57226',
     'rsrc/js/application/conpherence/behavior-pontificate.js' => '21ba5861',
     'rsrc/js/application/conpherence/behavior-quicksand-blacklist.js' => '7927a7d3',
-    'rsrc/js/application/conpherence/behavior-widget-pane.js' => '1ec93bcf',
+    'rsrc/js/application/conpherence/behavior-widget-pane.js' => '31b18ee7',
     'rsrc/js/application/countdown/timer.js' => 'e4cc26b3',
     'rsrc/js/application/dashboard/behavior-dashboard-async-panel.js' => '469c0d9e',
     'rsrc/js/application/dashboard/behavior-dashboard-move-panels.js' => '82439934',
@@ -559,9 +559,9 @@
     'javelin-behavior-boards-dropdown' => '0ec56e1d',
     'javelin-behavior-choose-control' => '6153c708',
     'javelin-behavior-config-reorder-fields' => '14a827de',
-    'javelin-behavior-conpherence-menu' => 'e67cfd8c',
+    'javelin-behavior-conpherence-menu' => 'eaf57226',
     'javelin-behavior-conpherence-pontificate' => '21ba5861',
-    'javelin-behavior-conpherence-widget-pane' => '1ec93bcf',
+    'javelin-behavior-conpherence-widget-pane' => '31b18ee7',
     'javelin-behavior-countdown-timer' => 'e4cc26b3',
     'javelin-behavior-dark-console' => '08883e8b',
     'javelin-behavior-dashboard-async-panel' => '469c0d9e',
@@ -954,19 +954,6 @@
       'javelin-dom',
       'javelin-reactor-dom',
     ),
-    '1ec93bcf' => array(
-      'javelin-behavior',
-      'javelin-dom',
-      'javelin-stratcom',
-      'javelin-workflow',
-      'javelin-util',
-      'phabricator-notification',
-      'javelin-behavior-device',
-      'phuix-dropdown-menu',
-      'phuix-action-list-view',
-      'phuix-action-view',
-      'conpherence-thread-manager',
-    ),
     '2035b9cb' => array(
       'javelin-behavior',
       'javelin-dom',
@@ -1056,6 +1043,19 @@
       'javelin-install',
       'javelin-typeahead-source',
     ),
+    '31b18ee7' => array(
+      'javelin-behavior',
+      'javelin-dom',
+      'javelin-stratcom',
+      'javelin-workflow',
+      'javelin-util',
+      'phabricator-notification',
+      'javelin-behavior-device',
+      'phuix-dropdown-menu',
+      'phuix-action-list-view',
+      'phuix-action-view',
+      'conpherence-thread-manager',
+    ),
     '331b1611' => array(
       'javelin-install',
     ),
@@ -1888,19 +1888,6 @@
       'javelin-behavior-device',
       'phabricator-keyboard-shortcut',
     ),
-    'e67cfd8c' => array(
-      'javelin-behavior',
-      'javelin-dom',
-      'javelin-util',
-      'javelin-stratcom',
-      'javelin-workflow',
-      'javelin-behavior-device',
-      'javelin-history',
-      'javelin-vector',
-      'phabricator-title',
-      'phabricator-shaped-request',
-      'conpherence-thread-manager',
-    ),
     'e723c323' => array(
       'javelin-behavior',
       'javelin-stratcom',
@@ -1922,6 +1909,20 @@
       'phabricator-phtize',
       'javelin-dom',
     ),
+    'eaf57226' => array(
+      'javelin-behavior',
+      'javelin-dom',
+      'javelin-util',
+      'javelin-stratcom',
+      'javelin-workflow',
+      'javelin-behavior-device',
+      'javelin-history',
+      'javelin-vector',
+      'javelin-scrollbar',
+      'phabricator-title',
+      'phabricator-shaped-request',
+      'conpherence-thread-manager',
+    ),
     'efe49472' => array(
       'javelin-install',
       'javelin-util',
diff --git a/webroot/rsrc/js/application/conpherence/behavior-menu.js b/webroot/rsrc/js/application/conpherence/behavior-menu.js
--- a/webroot/rsrc/js/application/conpherence/behavior-menu.js
+++ b/webroot/rsrc/js/application/conpherence/behavior-menu.js
@@ -8,6 +8,7 @@
  *           javelin-behavior-device
  *           javelin-history
  *           javelin-vector
+ *           javelin-scrollbar
  *           phabricator-title
  *           phabricator-shaped-request
  *           conpherence-thread-manager
@@ -23,6 +24,8 @@
     node: null
   };
 
+  var scrollbar = null;
+
   // TODO - move more logic into the ThreadManager
   var threadManager = new JX.ConpherenceThreadManager();
   threadManager.setWillLoadThreadCallback(function() {
@@ -49,7 +52,7 @@
     var messages_root = JX.DOM.find(root, 'div', 'conpherence-message-pane');
     var messages = JX.DOM.find(messages_root, 'div', 'conpherence-messages');
     JX.DOM.appendContent(messages, JX.$H(r.transactions));
-    messages.scrollTop = messages.scrollHeight;
+    scrollbar.scrollTo(messages.scrollHeight);
   });
   threadManager.setWillSendMessageCallback(function () {
     var root = JX.DOM.find(document, 'div', 'conpherence-layout');
@@ -71,7 +74,7 @@
         // Ignore; maybe no files widget
       }
       JX.DOM.appendContent(messages, JX.$H(r.transactions));
-      messages.scrollTop = messages.scrollHeight;
+      scrollbar.scrollTo(messages.scrollHeight);
 
       if (fileWidget) {
         JX.DOM.setContent(
@@ -116,6 +119,10 @@
     }
     markWidgetLoading(true);
     onDeviceChange();
+    var root = JX.DOM.find(document, 'div', 'conpherence-layout');
+    var messages_root = JX.DOM.find(root, 'div', 'conpherence-message-pane');
+    var messages = JX.DOM.find(messages_root, 'div', 'conpherence-messages');
+    scrollbar = new JX.Scrollbar(messages);
   }
   init();
 
@@ -320,7 +327,7 @@
   function _scrollMessageWindow() {
     var root = JX.DOM.find(document, 'div', 'conpherence-layout');
     var messages_root = JX.DOM.find(root, 'div', 'conpherence-messages');
-    messages_root.scrollTop = messages_root.scrollHeight;
+    scrollbar.scrollTo(messages_root.scrollHeight);
   }
   function _focusTextarea() {
     var root = JX.DOM.find(document, 'div', 'conpherence-layout');
@@ -373,7 +380,7 @@
     new JX.Workflow.newFromForm(form, data)
       .setHandler(JX.bind(this, function(r) {
         JX.DOM.appendContent(messages, JX.$H(r.transactions));
-        messages.scrollTop = messages.scrollHeight;
+        scrollbar.scrollTo(messages.scrollHeight);
 
         JX.DOM.setContent(
           header,
diff --git a/webroot/rsrc/js/application/conpherence/behavior-widget-pane.js b/webroot/rsrc/js/application/conpherence/behavior-widget-pane.js
--- a/webroot/rsrc/js/application/conpherence/behavior-widget-pane.js
+++ b/webroot/rsrc/js/application/conpherence/behavior-widget-pane.js
@@ -297,7 +297,7 @@
             }
             if (messages) {
               JX.DOM.appendContent(messages, JX.$H(r.transactions));
-              messages.scrollTop = messages.scrollHeight;
+              JX.Stratcom.invoke('conpherence-redraw-thread', null, {});
             }
 
             if (r.people_widget) {