The best way to describe the issue is to reference the graphics bug that affected barbed wire in arma2 and for a short period the corpses of army men that were placed around military areas like balota and the NWAF.
Basically large polygons (not static) of solid colour or black will fire at my screen out of objects, players, buildings. There is something weird happening with the rendering as these polygons will do strange things. For example experiencing it at night will cause a visible gamma shift similar to when a player looks into a light source and loses night vision. {F31067}