MP crashed with a font issue despite having the CD soundtrack added in.
Not sure what's causing it (deleted cache and everything) but I found a city and am unable to build anything on the first turn, which prevents the game from being able to progress. Tried two different games, one with Brazil and one with Japan, and both suffered from the same problem. I did try to sneaky-sneaky cheat in some More Wonders, so that may be the culprit, but I attempted two games without them (one as Shoshone and one as Morocco) and it crashed to desktop on the DoM without a freeze-up and "Civ V is not responding" error message.
EDIT: Nah, I fixed it. Thought I'd removed EUI before testing but just realized it was still in the DLC folder. Haven't tested yet, but everything should be good now.