(PC) need urgent help! have a graphic bug that creates a white wall. the game also does not longer change the night and day mode. it always remains as if is night with very low visibility/fog (see picture!). it's not my hardware. initially still a restart worked, which now also no longer helps! if I load an old savegame where this error did not occur everything is ok again. until again after a few hours this bug occurs! so I can not play the game!