I just bought a single processor, 1.25 GHz PowerMac G4 and am loving it. I bumped up the RAM to 1.25 GB right away and am enjoying learning about OS X. Anyway, I noticed that when playing DVDs in OS 9 (my PowerMac is OS 9 bootable), layer changes are seamless. When playing the exact same DVDs in OS X, the layer changes are noticeable. It's not as bad as my standalone Panasonic DVD player, but it's definitely not perfectly seamless as when playing a DVD in OS 9. I have not attempted playing a DVD in OS X's Classic mode. What could be the cause of this? It's nothing major--just a minor quibble.