Frontend queue polling doesn't render HTML until content changes

common/lib/xmodule/xmodule/js/src/capa/display.coffee

@@ -39,13 +39,12 @@ class @Problem
 
   poll: =>
     $.postWithPrefix "#{@url}/problem_get", (response) =>
+      @queued_items = $(response.html).find(".xqueue")
+      if @queued_items.length == 0 
         @el.html(response.html)
         @executeProblemScripts () =>
           @setupInputTypes()
           @bind()
-
-      @queued_items = @$(".xqueue")
-      if @queued_items.length == 0 
         delete window.queuePollerID
       else
         # TODO: Dynamically adjust timeout interval based on @queued_items.value