I ran into a problem with Far Cry 4 on PC when I would open the map and exit it. The problem was that the frame that was on screen before opening the map appeared to be stuck as sort of an overlay after I closed the map. It would stay static on my screen until I re-launched the game. It was getting really annoying. The fix for me was changing anti-aliasing from SMAA to any of the TXAA's or off. This glitch drove me crazy and I hope it will help any one else that is having this problem. I don't know if it is an SLI problem or what but it was making the game unplayable for me.
Thanks for reading, hope this helps!