title: IE11 hangs during file upload with AjaxFileUpload
body: <p>Strange problem appeared with IE11 few days ago. The plugin, wich worked good (<a href="https://github.com/davgothic/AjaxFileUpload" rel="nofollow">https://github.com/davgothic/AjaxFileUpload</a>) now doesn't want to. After I choose a file and click "Load" IE deathly hangs. Only kill process helps. I looked into deep jQuery code for posting data and can't find where to put breakpoint before it hangs.
  The submitting data is ok, file recieved on server and handler correctly worked, it returns the XML with some info. But no more events (such as "ajaxComplete") called on client after the handler's "context.Response.End();".
  Where can I find the problem? It is only in IE11 and on many different machines. IE10 works OK...
  Appreciate for any help!</p>