Do not trigger rerender on client disconnect.

app/assets/javascripts/app/controllers/users.coffee

@@ -78,7 +78,7 @@ class Index extends App.Controller
       $('#app').hide().attr('style', 'display: none!important')
       @delay(
         =>
-          App.Auth._logout()
+          App.Auth._logout(false)
           @ajax(
             id:          'user_switch'
             type:        'GET'

app/assets/javascripts/app/controllers/widget/switch_back_to_user.coffee

@@ -36,7 +36,7 @@ class Widget extends App.ControllerWidgetOnDemand
     $('#app').hide().attr('style', 'display: none!important')
     @delay(
       =>
-        App.Auth._logout()
+        App.Auth._logout(false)
         @ajax(
           id:          'user_switch_back'
           type:        'GET'

app/assets/javascripts/app/lib/app_post/auth.coffee

@@ -132,8 +132,8 @@ class App.Auth
     App.Event.trigger('ui:rerender')
 
 
-  @_logout: (data) ->
+  @_logout: (rerender = true) ->
-    App.Log.debug 'Auth', '_logout', data
+    App.Log.debug 'Auth', '_logout'
 
     App.Ajax.abortAll()
 
@@ -142,7 +142,8 @@ class App.Auth
 
     App.Event.trigger('auth')
     App.Event.trigger('auth:logout')
-    App.Event.trigger('ui:rerender')
+    if rerender
+      App.Event.trigger('ui:rerender')
     App.Event.trigger('clearStore')
 
   @_loginError: ->