Can you try it with standard Shareware Jazz, just make a 1-tile thick, hollow box, inside the box put the player and nothing else, and it WILL break. This happens on Shareware and HH95 for me, so can you test it(I have a feeling it might have something to do with my DOSBox Settings or my PC, so I don't want to test it, in case my computer is broken, which -- to be honest -- wouldn't surprise me much).