I got a problem with reporting services, running local rdlc files on the 2005 version.
I have in the HTML a report viewer set to run locally as follows :
Try using a simple report , sometimes reportviewer throws exception caused by invalid RDLC and shows an empty report.
Try also to debug the project and look at the output window in Visual Studio: you will see the warning raised bu the RDL engine, it could be useful to investigate the reason of the error.