safari full screen streaming doesn't work after last upgrade of Windows 8.1

safari full screen streaming doesn't work after last upgrade of Windows 8.1

 

This is very strange situation...I start with a built safari Flashplayer. Then I go to the windows. After some time flashplayer in the safari is stop working .. If I exit from fullscreen in Windows the flashpplayer starts again. But after a few seconds it stops again. If I then go back to fullscreen flashplayer starts to work again for a few seconds, and so on. This situation arose after yesterdays automatic upgrade windows.