I've got a PowerBook G4 here with some random problems. When iMovie is opened I get this error message. iMovie requires Quicktime version 6.5.2 or later. In system preferences, it shows Quicktime v. 2.1. I installed Adobe Premiere 5.1 a few months ago, and had some trouble with QT then, but I solved that, however, iMovie just recently stopped working properly. I just updated to OS 10.4.7 which didn't fix the problem. All other software is properly updated. Someone please help me.