ASP.NET 2.0 Custom Membership Provider Breaks After Deployment to IIS 7.5

ASP.NET 2.0 Custom Membership Provider Breaks After Deployment to IIS 7.5
I am developing a www site on a Win7 64, using VS2008 and a SQL2008 Server. It has a custom membership provider, which when I compile and run the site from VS2008, everything works fine.
The site when deployed to a 2003 64bit server, with a remote SQL2008 server also works fine.
I installed IIS 7.5 on the dev machine, made a copy of the site and mounted it in IIS7. When I start the site up, everything loads without errors. The site uses integrated windows security, which if the user is not in the provider database they get forwarded to a not authorized page. I get forwarded to the not authorize page, not matter what I do to the configs.
I tried using the tips suggested here:
http://weblogs.asp.net/nannettethacker/archive/2008/11/14/membership-pr ...