safari flashplayer plagin doesn't work properly after last upgrade of Windows

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.