Playing as Russia solo and using the Swatter Mod, my game eventually ('40 or '41) reaches a point where the save games corrupts and won't proceed any further. When this happens, the game crashes and gives a Runtime Error R 6025,:Pure Virtual Function Call (or something like that).
At least one bit of searching on via Google took me to a site that told me my game installation had corrupted, and that I needed to reinstall.
I did that, tried again, and the problem repeated.
I'm trying a similar type of game but this time using the stock '39 campaign playing as Russia - so far the stock '39 campaign is running smoothly.
General game setup - Russia Human, all else AI. Germany, Italy, and other Axis Balkan states at Very Easy, all others at Normal resources.
Any ideas, or anybody else seeing something similar?