To add - if I play for 5-10 minutes, then try to use the item filter, it will crash about half the time. If it *doesn't* crash, then I can generally filter as many times as I like, getting no crashes. If it *does* crash, then it's likely to crash again and again as I reload the savefile. Switching from fullscreen to windowed mode seems to break out of this cycle, and often if I'm getting crash-after-crash upon reloading a savefile and filtering, I can alt+enter to play in a window, and then the filter often works.
This doesn't mean to say, however, that the game never crashes when playing in a window. It sometimes does!
I set my noteye FPS to high values (60fps or higher) - I wonder if this could be having some effect?
I also run fullscreen in 800x500 (ie, not native resolution)