When you mess with the game settings like the sun settings it creates a black box on one direction the more you look twards it it getts bigger

I had that too. Ive got this by setting up ZAM Ad settings or whatever that is, its under FOV settings and i got this in my game so i had to restart it 

same

I'm aware of this issue, don't use the sun setting, it will only work on a few maps and glitch out on other. It will be removed if there will be other ZAM client updates.