There's a slight freeze before the crash -- similar to freezes I'm observing while traversing areas I haven't been to in this patch. It's like the game is loading stuff off disk (an SSD btw, so this should be quite fast), and sometimes crashes while doing it.
I'm running a fully updated OSX 10.8.2. I'll gladly provide more info, if need be.
Edit: Just happened again, opened the grave in Matriarch's Bones event (Act 1).