I started messing around with a fresh copy/uboat missions/monsun mod
I can select the type XXI in the dropdown menu of 1st Flottilla in 1939 but when I want to proceed to the office, it crashes
Been also messing around with earlier recommended files (upgradepacks, ammunition, submarine related files - goal was to lower the unlock date of everything I came across to 1939 but no cigar right now.
What in the context of modding does "NULL" mean - no specific date given (so always available?)