I've been using beta2 since TechEd without any problems. Last week when I tried to debug one of my ASP.net apps I get the error "unable to start the debugger. You must be a member of the debugging users group". I am (and always have been) a member of the group. I'm logged in as administrator to boot. Debugging is turned on in the project. The server is sitting on my local machine. I'm stymied. I've looked at my web logs and it is showing error 401 (invalid credentials) when trying to run the debug. For example:

15:11:08 127.0.0.1 DEBUG /TestApp/Default.aspx 401

I've tried reinstalling beta2, restarting my IIS, rebooting, making sure anon access is available for that web project, etc, to no avail. Has anyone experienced this or know how to fix it?