I seem to have similar problems, only running Logic 8. However, these Logic problems seem to coincide with other OS X weirdness right after the update to 10.6.8 (combo update):
1. When opening a file (from Logic 8, for example), I can click through my folders/drives only twice before the open dialog closes. Really, really, really strange. And when I try opening a file from Chrome, it crashes the program.
2. I notice in Logic 8 that the "Screenset" menu option is blank all the way through until a project is opened...like the menu is incomplete...???
I'm sure there are other as-yet-undiscovered things, but the #1 above is pretty bad.