I sort-of managed to reproduce this on a couple of scenes. I say sort-of because I can't figure out any concrete steps to guarantee it will happen. I open the UV Editor and move around UV shells, like you said. But it doesn't crash right away. So I just do random combinations of select and move until it happens. Select, move, select, select, move, select, move, move, move, select, select, etc. I've tried selecting and moving both individual shells and multiple shells. I *think* it is crashing when I have multiple shells selected, but I'm not 100% sure. Because it takes hundreds of selects and moves before it finally crashes.
The good news is, out of the six times I've gotten it to crash, one of them actually produced a crash log. It is attached to this message.
Question: Does your scene have any animation in it? Joint animation, vertex animation, scrolling textures, or anything else? I ask because the scenes I have gotten it to crash on contain vertex animation. But I only tried one scene without animation, and I didn't try for very long on that scene.
