Giant Half Dome Black Voids on maps. 

Last 2 maps in a row I have enounctered this giant black half dome voids in the map that you cant see into, you can walk into, mobs are in them, but its black, no detail., no anything. its a real pain in the butt trying to not get killed by turrets or mobs, or anything when a giant void of the map is missing.. I know its not my rig, its less than a mnth old and can push this game 3x over.