No I did not try that. But problem is not allways present, just after some time of playing. But when it hapens is I manage to get out of black it comes to normal then I save game and load it again and continue to play. Now sometimes black screen comes in second or detail comes to black or my character freezes, and sometims need more time. But allways this bug continues.
Thanks for tip, but how can I make game to use one core? Any more advice or help?