I would say, best bet, level 39 monk, 1 barbarian. (or is it two barb?) Get the fastest run speed you can, then DM speed on top of it, and you'll be much more likely to recreate the crash. I also would guess certain tilesets may help increase the chance, as well as the possibility that it may only happen with certain video card types, etc. If the latter plays a part, I'd put money on ATI cards being one of the troubled ones.