Performance tomorrow, jitter patch crashing; advice? (Threading, poly~ movie)

Hi,
I spoke to Andrew Benson a bit regarding this patch yesterday, but I sent him such a large response email that he is likely still reading it.

First, the patch is here (It's been changed a bit, but not substantially): http://andrewlb.com/max/mixer_20100217.zip

To preface, you're free to use anything and everything from it. My goal is to develop it a bit further and then release a bunch of those patchers as a unified set of monome video performance objects, but feel free to use what's there now.

It's a pretty big expansion on the VPS tutorial by Andrew, and yeah, I've built it out quite a bit (and also incorporated some other patches, such as stealing some of _vade's v001 modules) in the BANKS subpatch of the fxbank.

Anyway, yeah, this whole thing has been a learning exercise, but we're throwing an event in Toronto tomorrow (plug: http://www.facebook.com/#!/event.php?eid=314502728325&ref=mf) and I somewhat foolishly decided to perform as well.

Anyway, yeah, so still much crashing, 99% of the time here:
Thread 2 Crashed:
0 com.apple.QuickTime     0x93121912 QTMLGrabMutex + 18
1 com.apple.QuickTime     0x93193b96 ExecuteCallBack_priv + 24
2 ...ple.CoreServices.CarbonCore    0x943d222d TimerThread + 291
3 libSystem.B.dylib     0x921a0fbd _pthread_start + 345
4 libSystem.B.dylib     0x921a0e42 thread_start + 34

I've been trying a bunch of different methods to fix it: deferlow, defer, qlims, jit.balls, overdrive on and off, changing the amount of permissible slop, etc.
Learning a _lot_ in the process, but it's less than 24 hours till I'm playing and I'm beginning to panic a bit.

Andrew suggested that it might be the media but I re-encoded everything as photojpeg q85% 15fps 640x480 and it still crashes. I've also followed _vade's optimization guide and a number of other things, but still crashing (albeit when it works, it works like a charm).

Anyway, I think it's a matter of threadsafety and interrupting the quicktime processes, but I quite frankly don't know enough about it right now to debug this properly. I'm learning as quickly as I can, but would deeply appreciate your advice.

Thanks in advance!