VS2008 to VS2010 upgrade runtime problems

I just upgraded some crystal reports developed in VS2008 to VS2010. They worked perfectly fine in VS2008.

Now when I run certain reports in the viewer there is no problem but when called from .NET code with parameters being passed in using SetParameterValue it seems to ignore the parameter used to filter the select for the main report. The query executed on the DB server is then missing the vital where clause and all records are returned instead of just one.

has anyone come across this issue.