Here's a pic. The problem is outlined in red.
http://i194.photobucket.com/albums/z168/Elbow_02/2014-01-27_00001.jpg
This has been an issue since day 1.
I assume you have the Unofficial patches installed.
It could be GPU related.
I do have them installed. I doubt it's GPU related since this was an issue with my 2 580s and now my 2 780s.
BTW it's not just that spot, it's everywhere, I could be looking at a tree or a bush or something and that would happen.