Try deleting the files in the dynamics folders ('
..\Beyond Divinity\Acts\Act1\Dynamic', '
..\Beyond Divinity\Acts\Act2\Dynamic', etc).
After this, try starting a new game, and see if the zoom buttons in the auto map work properly, then check your latest save.
Try backing up your saved games and doing a clean un-install and re-install +
patch, making sure to shut down all non-essential programs (especially anti-virus) before doing so.