I'm having some playback problems on my powerbook that I hope you can explain/help me with. I rip with MTR compress and burn with popcorn All that works fine. If I burn on a DVD+RW playback from the dvd on the powerbook works fine. If I burn on a DVD-R (both Maxell) I can play back once- that is the computer recognizes the disk, it works in dvd player- just that once. It works on my friend's set top DVD player- but the powerbook just expells the disk.