How can i solve following problem while playing some videos with flash player?
Hello,
when i want to watch videos, they are starting like in this pictures below:

They are black and u can see big pixels. Sometimes the colorts aren´t right/ or inverted.
After a few seconds, the video changes to normal.
This issue happens on different pages, Youtube, Facebook, ...
I´ve already tried to
- de- and reinstall Firefox, Flash Player, etc.
- restaurated firefox,
- manually deleted all plugins/ addons
- changed from win7 to win10 - issue remained
Here are my dxdiag-informations:

I hope somebody can help me, because this is really annoying.
Greetings and thanks!
Benni