Does the game become unstable once you conquer too much territory? In my current game as Japan I have just defeated the Soviet Union after taking out Allies and Axis (I'm going solo) and when I load my latest savegame everything seems fine at first, but when I scroll by moving the cursor to the edge of the screen, eventually (within the first minute or so) the games freezes and then crashes. I have tried it three times now, every time the game crashed within the first minute or so.