Well theres no problems on PPC macs with the dialogs, only intel macs. it is not 100% compatible, it renders fine tho - and everything works, just slow when you start getting more than just a few objects.
It tages ages to startup aswell - But that said, I think it will be killer fast and really really nice when it becomes UB!
Carsten Lind
Senior 3D Artist,
Maya Software Manager & Maya Instructor
LEGO Systems A/S