Out of curiosity... Which version of OSX are you running? I'm assuming since you're on a G5, that you're running Panther. For what it's worth, I haven't had any problems with short clips and crashes in P5 and OSX 10.2.8 Then again, I'm on a G4 with 384 MB of RAM. I may try leaving my mac up and running for a few days and see if the memory issue raises its ugly head with me.