I currently own Alexandreia as the Seleucid Empire. I have received the quest of sending the body of Alexandrios back to Pella, but have yet to do that. In the save game, when I give Alexandreia to an enemy faction and immediately retake it, a CTD happens no matter which faction I give it to, and no matter whether the army that takes it has a general or a captain.

Link to save file: http://www.axifile.com/?7449505