SSRS no longer relies on IIS. It is my understanding that you must configure everything in the SSRS configuration tools and not use IIS.

http://blogs.msdn.com/b/euanga/archive/2007/12/04/sql-server-2008-reporting-services-no-longer-needs-iis.aspx

Thank You!

That is really odd, but I suspected that it was something like that.

I have been searching all over for someone who has also had this issue. Did you ever get it resolved? I have cascading parameters of State > City > Zip...I...