Oh boy, I should have listened to the other reviews.

No issues at all for weeks whilst playing with every other main expansion pack activated. I buy this DLC and now my game crashes every campaign I play, but never right at the start when I wouldn't care too much. No, these crashes never crop up until I'm really into the campaign and then suddenly, BAM, no more campaign for me.

10/10 DLC would buy again because I'm a fool.