If you are running Studio Manager 7x on FileMaker 8, we advise you to use FileMaker 8 version 1 until version 3 is made available. FileMaker Inc. issued FileMaker 8 version 2 to address some issues that were found in version 1. They addressed these successfully but introduced some architectural changes that created other new issues. The original issues in version 1 should not be a problem for Studio Manager users unless you are aggressively customizing the application in ways that version 1 had problems with.
If you aren't already aware of the now well-documented issues, take a look at today's post on my FileMaker Fever blog entitled: Documented Issues in FileMaker 8 v1 and v2.