I started by moving bones around for quite a while without an issue. Then, I decided to start over and count how many times I moved a bone...here are the numbers before crashing: 57, 39, 16, 2. rebooted, 37, 37, 34. Then, I decided to move Groups instead, here are the numbers before crashing: 2, 2, 2, rebooted, updated video drivers, 2.
So, I don't think it is isolated to just moving bones.
Hope that helps.