True enough I can only get the (online) demo to work the first time.  All subsequent attempts to upload a local file result in my company's proxy demanding credentials.  If I cancel the request for credentials dialog I get a 407 error (proxy credentials required).  Now this obviously could just be an issue with our proxy.

 

If I remove the proxy issue altogether and use the demo locally it is perfectly fine with anonymous turned on but fails with a 401 everytime I use windows authentication.  IE tells me it is connected through local/intranet so I'm assuming no proxy is in the way.  If I put valid credentials into the dialog IE locks up, cancel the auth dialog and it tells me about the 401.

 

Now this may or may not be the same issue as the online one but I just want to eliminate windows auth being specified as a problem.  Has the control been tested with windows auth (anonymous off)?

 

Thanks