One of the bugs I experienced during the short time I had 1.5 installed was crash to desktop with the "Ready to launch boat" pop up. Didn't matter whether I clicked launch boat or postpone, in fact half the time I'd be running at high speed chasing a convoy and wasn't even on that type of mission, CTD. Never had that exact type of bug, but I suspect you're looking at just dumping that patrol and going back to an earlier save. Or skip the actual mission, you don't get that many points from completing a mission anyway.
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