Hee, yay! Hopefully it keeps working. The Auto Save feature and keeping an eye on whether your footage starts to lag at all (when scrolling through it jumps from one place to another missing really big inbetween sections), or your audio stops playing (while still on the timeline)...that's all I can think of right now, will be your friends. Those are just things I've noticed as warning signs that Premiere and avisynth are hoarding memory and thinking about crashing. ;)