Well, I've seen crashes on exit myself pretty consistently on one machine for about the last three months, but never took the time to even look at the backtrace, because it only happens on exit, at which point I no longer really care if the app is running. :-D
In your backtrace, it looks like the app is manipulating UI classes (deallocating them in this case) from a non-main thread. When you touch the UI from a non-main thread, you're going to have a bad time. No idea how to fix the bug, though. (I haven't really looked at the OBS code base much yet.)
