Worms Armageddon: random crashes

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I installed Worms Armageddon on my new computer and the program just suddenly quits on me, unexpectedly. No error messages, no nothing. I also remember the same thing happening to my old computer. The thing is, it only happens while loading or at the beginning of a game. I can access the options menu fine, but games always crash. What the hell is going on?

edit: I can do training missions just fine. It's the games that screw up.

edit again: I can also do single-player missions fine (although whenever I press escape, keyboard input stops working...). It's just the regular games.