I remeber some people in the community with the same bug. Check the pic:
There is this weird graphical glitch that appears sometimes in the battles, a huge black, white, yellow orange texture that pops up and blocks the view and also disappears depending on the zoom to the units. I noticed that it is related to the units. If I change the resolution of the units the distance that this artifact appears also changes. I generally dont have it from begining so maybe it is related to dead units? Is there any solution to this? TATW is the only mod I ever witnessed this bug.