Reporting Server not on MSCRM webserver?

If you have Reporting Server installed on a different server, then you should definately read this document:
http://www.microsoft.com/downloads/details.aspx?FamilyID=51bf9f20-bd00-4759-8378-b38eefda7b99&DisplayLang=en

This will help you to get Reporting to work again.

Happy reporting!