Show warning when page didn't load completely.

src/General/Main.coffee

@@ -219,6 +219,12 @@ Main =
 
   initThread: ->
     if board = $ '.board'
+      unless $ '.board + *'
+        msg = $.el 'div',
+          <%= html('The page didn&#039;t load completely.<br>Some features may not work unless you <a href="javascript:;">reload</a>.') %>
+        $.on $('a', msg), 'click', -> location.reload()
+        new Notice 'warning', msg
+
       threads = []
       posts   = []