I originally logged this problem under another forum because I didn't have all the details. Help please !! I'm running 10.3.9 on a 1.5ghz G4 Powerbook with 1GB DDR SDRAM, and today whilst working with iMOvie the whole show slowed to a crawl. It is impossible to edit anything as the catherine wheel just spins. Can't play a movie (thorough iMovie either) as it is slow and jerky. (iLife04). The whole system has slowed. I recopied iMovie from my external hard drive backup and it worked once and now has returned to dead slow. Recopying doesn't help. I had a similar problem a while ago when iMovie died and wouldn't open, but restored the whole operating system and it worked. I don't want to go through that again as I had SO many problems reloading downloaded software and getting the printer to work. Someone said I may have problems with the hard disk. I've repaired all the file permissions. I created a new user logged in under that, but no different. Once I changed all the folder permissions etc I am in under the other user AND it all is still the same. Worked OK until I went to timeline viewer and it got stuck and locked up. (I opened it from the original folder - Movies in the home user). Then, I tried the following. Copied the project onto the external hard drive and started it all from there with 30GB free space. Same problem. However, just to check, I tried another backed up file from some months ago and it works in as much as I can edit volume through the timeline viewer??? Back to the mac and tried iMovie on a few files. Lockup again. Now, I "shared" a clip to the desktop (.dv) and then created a new project and imported the clip. I can edit this new project through the timeline viewer as per normal. Am I now getting the message that iMOvie has somehow corrupted all my files and I will need to copy them down, delete the original file, and then create them again ? How can this be ? Anyway, I decided to do the above this arvo. Copied all the clips to the external drive, made up a new movie and used the copy of iMovie on the external drive. Stayed away from the Powerbook. It was all going well, finished and I moved to timeline viewer when iMovie unexpectedly quit. Once I started it again ALL the above problems returned. Now, I have had problems with programs unexpectedly quitting before - Safari etc. By the way, this is not the first time I've had trouble with iMovie - it locked up a month or so ago and I reloaded the original discs and operating system with all the attendant problems that brings. Could I have something wrong with the hard disk ? The local Apple shop wants me to spend $100+ to analyse the machine. I've got 4.1GB free left - a little tight, but enough to write a DVD and then clear this stuff off my system when and if I can get it to work. I had 20GB left on the external drive after all this. I purchased a Mac because I had all this sort of problem with Bill Gates PC and Windows and hoped I'd left it behind.