MVC is looping

Ok, I have no idea how to figure this out. I contacted support but they shot me over here.

I created a very small MVC app to test out some routing ideas I had as a prototype for a client. I created a virtual directory on my godaddy hosting (because my discountasp.net hosting was set for classic mode) and published my mvc app to the virtual directory - it worked fine (http://dougakins.com/_mvc). Of course the same app worked fine when I ran it locally. Then I changed my discountasp.net hosting to Integrated mode and created a virtual directory and published the files. But all I got from Firefox was "The page isn't redirecting properly".

To make a long story short, I ended up deleting the Virtual Directory and creating a new one. I created a new MVC app - just the default template that Microsoft outputs when you create the app - and uploaded it without any changes at all and it still won't run.

I started off just uploading the System.Web.Mvc.dll to the bin. Then I tried adding the System.Web.Routing.dll. I also added System.Web.Abstractions.dll, System.Web.Extensions.dll and System.Web.Services.dll.

Nothing I did seemed to make it work and discountasp.net is telling me it's a programming error. Any thoughts?