I just stumbled upon a crash between Summer and Winter of 1204 in the same campaign. I end my turn, and the AIs start to play their moves and then the screen just goes black and I can't even alt+f4 out of this one...the AI faction-logo 'cycle' got around to the Kievan Rus', but I have no idea what it did to cause it or even if that is what caused it. I'm also a newb so I don't know how to provide a logfile if such thing exists...

It was a shame because that campaign was just starting to get interesting :(