Reports won't run or validate in Report Studio

[dendo]

Hello all,

Having a problem with Report Studio in version 8.3.  When I have a report with parameters, I can't validate in RS because the pop-up that asks for values for parameters in required filters will not display - I just get a white screen that eventually gives me the standard Windows "Cannot access webpage" screen.  For about half my reports, this also happens once I try to run the report from RS.  If I save, the report will run fine from Cognos Connection.  This is making report development difficult because I can't see sql, validate or run reports while developing them.

To add to this, if I work directly on the Cognos server, I have no issues.  This only happens when I am on a client PC.

Please help!