The behavior is the same with both browsers, I don't think its NTLM, when I bypass the proxy I get the page loaded to completion which is a login prompt. With the proxy server set, I don't even get that far, it kinda hangs midway through loading the page.
Yes, but it is not a definitive conclusion ; for me as far as the NTLM issue is concerned. I als manage bluecoat proxy devices, and I can see that the site works through them too, which is not much help to you, I know. M.