Not going to mention all the usual crashes, but the map editor crashes or runs into problems if you simply load up a map, then try loading another one up. Looks like you may not be clearing out everything before the reload attempt. (similar thing happened before when loading games within games, but looks like you fixed that)
This is pretty consistant and repeatable - can make the game crash/hang updon 100% of attempts if I want. (And happened before but was hoping it'd get fixed...)