The Divine Eye skill should not crash the game (I just double checked it, with and without the Steam client running). However, there is an issue with that skill that limits its usefulness: it doesn't clear the fog of war. If you wish you can use iZakaroN's SaveEditor (or from Kiya's site, with description) to unlearn the skill and get the point back.
If your sight range is high enough it may still be worth checking out, then try temporarily disabling your secondary screen and shut down all non-essential programs before starting the game, and see if that makes a difference.