[Ronaldo Montalvo]

might not apply, but i had a similar problem with qtime 7 on the mac with afx 6.5.1, trying to render from a year old project that used to render fine. ended up having to uninstall qtime 7 and reinstall qtime 6.5.something, and everything rendered fine, no crashes. look on the mac support site for the uninstall routines. ultimately ended up having to re-install qtime 7 which also “broke” the canopus video I/O functionality. that problem, i think, was mac-specific having to do with quicktime receipts and permissions and was experienced by many unhappy users on the apple support forums with a variety of devices and cameras.