Stability for 3.7 is our top priority right now. Any information about what you were doing just before a crash would be extremely helpful!
There are some crashes in 3.7 that we have not been able to track down. We get error reports of the crash, but it happens when drawing the skeleton. Something the user has done previously puts the skeleton in a bad state, then it crashes the next time it tries to draw the skeleton. Unfortunately the users experiencing these crashes haven't reported what they were doing that might have caused it, so it is difficult to track down.
That aside, 3.7 is otherwise ready to come out of beta. Many beta users don't experience such crashes.