I've been spending all day trying to get to the bottom of this crash. It happens when there's several changes in frame/application restarts. The error lists kcarray.mfx as the cause so I was looking for some user error there. Eventually I started removing pieces of the game bit by bit and testing if the crash still happens. I've removed everything but 2 lines of code switching frames, zip object, 3 active box objects and several arrays. Removing anything else stops the crashing, but nothing there should logically make it crash under this circumstance.
Here's the MFA: https://www.dropbox.com/s/ggn79q90op...m-BAD.mfa?dl=0