Hi!
Well, since it worked on another server (site) I can only asume that your server (site) was not configured corectly. I do not think there is a bug in Visual Studio.
Please revise your web server settings. Here is what a Bad Request mean, and maybe a resolution for your problem:
http://support.microsoft.com/kb/247249Regards,
Lucian Baciu, MCTS,
http://studentclub.ro/lucians_weblog