[CapnScurvy]

The UPC files are the worst ones for causing strange behavior with saved games, and the practice of shifting in and out mods. The reason is they are saved in your "SH4" folder, found within the "Documents" (or "My Documents" for an older OS) folder. The "SH4" folder is NOT to be confused with the main game folder called "Silent Hunter Wolves of the Pacific". The SH4 folder is made automatically the first time you start the game, and remade anytime you delete it from your "Documents" folder. It contains your chosen game options like screen resolution, unit of measurements, manual or auto targeting etc. It also holds all of your automatic and self made saved game information that make up a saved game point.

I'm not saying this is anyone's problem that have been pointed out lately, but.....just for your information.......the saved UPC files in the SH4 folder will cause CTD's due to adding/removing mods, then replaying a saved game point. Any changes made to the saved UPC files are trouble when replaying a saved point. It's the changing of UPC files that have required the known instructions to "add this mod only when your in-port", not during an active patrol. The game automatically set's a new saved game point everytime you enter/leave port.