BPC error: Object reference not set to an instance of an object

Hi,

We have BPC 7.0 NW SP7 installed on Win 2003 (64-bit) server.

I can launch and login to BPC Administration with no error,  I can even create new dimensions.

But whenever I try to add a new application I am facing the error message :

"Object reference not set to an instance of an object"

All the BPC clients we installed get the same error.

Running the BPC Server diagnostics suggests everything is OK with the install except one issue: "Current usre name does not have permission for Administrators groups" despite the fact we granted all privileges to our BPC user.

Please advise how to overcome this "object reference..." issue.

Thanks,

Balazs Kovacs