FCP and Compressor are the main programs I've been using from the suite since the upgrade, and I haven't had any problems (at least, any that I think are coming from Leopard). I have noticed that Compressor turns the menu bar from transparent (which FCP keeps) to grey, along with the menu selection (which is blue by default). Not that that has been a problem, or anything, but I thought it was an interesting thing to note. 🙂
Take care,
Sojourn