Altiris ITMS 7.5 SP1 console freezes

I have updated to ITMS 7.5 SP1, and the console freezes when I try to add a location OU. I go into: Actions -- Discover -- Import Microsoft Active Directory

We had the same import rules after the upgrade. We have computer and user resources setup, but both lock up when you select the 'starting from Computers/Users'. I have tried creating an entirely new import rule with the same specifications, but it does the same thing.

Sometimes I get a message: *Server* is not responding due to a long-runnings script.

Thanks,

Steven B.