I changed the screen resolution slightly, but I doubt that had any effect. At any rate, I started another game and managed this time to get into a tactical battle. After a half hour of play, the game CTD in the middle of another tactical mission. This occurred when, after tossing a flare that bounced off a wall and fell at a trooper's feet, I selected the satchel bag to see if I could retrieve the flare (didn't want to illuminate my own trooper at night!). As soon as I attempted to click on the satchel, I had the CTD.