I seem to have a bug where every time I move around with mercenaries enough, the game crashes. I've tested the pattern enough to know that it is indeed from mercenaries which wouldn't be so bad were it not for the fact that I'm currently playing as a republic in Ireland after having formed a republic, with the Charlemagne DLC features. Suffice to say, this bug is mildly gamebreaking. Raising the mercenaries doesn't crash, it's moving them, usually moving them to particular spots, and I'm not sure why that is.