- Make an animation
- Open Playback window (as a separate window)
- Maximize
- Make the animation loop
- Go on a lunch break
- Come back to your desk and cry
So this has happened to me on two occasions, the first time it happened I lost some progress on my work because I hadn't saved in awhile, the second time I had saved but I decided I wanted to test it out. Sure enough when I got back from dinner it wasn't responding anymore. I'm not sure if the animation has to be looping or not or if the playback window has to be maximized/in a separate window.
Being that this only happens after some length of time has passed I assume some variable is getting too large or some counter isn't being reset. If an overflow were to happen to make a number go negative that would definitely cause a crash in most applications. Either that or it's a stack overflow.
I would advise people to close the window if they are going on a break. Save early and save often people.