Still running my old G4 dual 1.4 with os10.3.9, 8.2.3a and FCP 4.5HD. Currently all is running well together. I've just been given FCP 5.1HD and it says it requires OS 10.4. Will 8.2.3a run ok on OS 10.4? Boss has clients that need us to upgrade FCP. Thanks! Kind Regards, Chris K.