hey i'd just like to let you know about this problem i'm having in EB1.1

in each battle i have involving cities, be it that they sally forth, or an army attacks me to relieve the city, i get a CTD. what's confusing is it CTDs right when you select the option a manual command of the battle for 'sally forth' battles, and it CTDs right after i win the battle for the 'relieve city' battles.

does anyone of you know how i can fix this problem?

thanks a lot :)