I'm playing the Darthmod campaign as the British and in my first year the Spanish besieged Gibraltar. I refused to surrender, and they commenced their attack. The loading screen popped up and the progress bar moved a tiny bit, and then stopped. I waited, and after a long time I CTRL+ALT+DEL-ed out of the game and found that Windows was telling me that it Napoleon had stopped responding. I closed it and tried again, this time attacking the besieging force a turn before. Exact same result.
Any idea what's going on here?