VS2010, against SQL 2K8 R2 - login failure when adding subreport.

I have tried a number of ways to get this to work.  Is there a set of instructions that can be followed to render a CR with a subreport?

I can create CR reports that run.  Can create subreports that run, but a CR containing a subreport will not run on the server.  Fails with a variety of errors, depending on whether I am using XSDs, OLE-DB or DSN connection.  I give up trying different methods and looking all over the internet for fixes.

What is the preferred method of connection?   I am using stored procedures, and typically have no prblem with RC, but I have to adwit - this- is the first time that I have tried a subreport.

I just cannot beleive how difficult this is to push into a non-dev environment.  Maybe I am missing something simple . . .

Dev: VS2010 on Vista.  CR SP1.  Server: Win 2K8 R2 Ent, SQL 2K8 R2

Thanks!