Whenever I attempt to play a battle in the Teutonic or Crusades expansion (custom or campaign, makes no difference) my game crashes to desktop when it finishes loading, telling me there's an unspecified error. It's just these two campaigns, Americas and Britannia work fine (I can even unpack and modify the files for them). I've done several fresh installs of both the expansion and original game, tried playing with files pack and unpacked, file first on and off, rolling back drivers, lowering my video settings, etc. The battles crash in the same fashion that they do when you haven't deleted the geography files after unpacking... but whenever I unpack either of the campaigns, there are no geography files to delete. Might that be the problem?

I'd appreciate any insights.