Fu####g Apple. Why in the F##K would they NOT make some kind of statement about it not being compatible with their own products. I was doing fine with my little FCPHD (4.5) and now I have to erase and install everything again. I am pissed as many looong time users are today. I have been avoiding upgrading FCP because I have a PowerBook G4 and everything is going along peachy-keen. Then another standard automated update from Apple (that I have trusted for EVER) goes and screws it all up.