although my system worked just fine, at some point it began to drop frames prohibitively, and at the same time became unable to render a project or selection without similar glitches and missed segments. i am running vv3 on 2.4g p4 w/ 512m ram. is there a system component which might have become corrupt? i reinstalled and all that, including my firewire card. thanks for any help which will obviate an os reinstall.