Rexsar
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it's possible that some other map is having a negative impact. (but definitely not one of mine). Or it could be a bug in the game itself. When you downloaded the game, did it come with a lot of fan-made additional maps? (are there many maps in the Maps folder?)
Scenarios - 8 (but there are your 2 + another one you downloaded, but the problem was before that)
GSC maps - 1
Multiplayer - 41