I tried again from my home PC...Windows 7 with IE 9 and Firefox (with Flashblock, which I disabled for the test)
First with Firefox...[a:a], got "guest41" user, still churned. I hit Cancel and Connect, still churned.
Stock IE9, no addons...[a:a], got "guest42", same as Firefox.
At least I got the user name change this time Image may be NSFW.
Clik here to view.