Green Youtube videos

[LynValentine 19]

Since a while i have a problem that i can't watch youtube videos in media players in SL, most of the time it looks like this https://gyazo.com/9c8bce1f017d1aa305ddc3d1186e114c right from the beginning, sometimes it seems to work for maybe 1 hour just fine and then turns green. I can still hear the audio, but can't see the video. I can watch the same videos in my normal browser without problems, so my system is capable of showing these videos. At the same time everyone else in the same room can watch these videos without any problem.

 

My system is a PC with a AMD APU A10-9700, 3.90 GHz, 16 Gbyte RAM, Windows 10 HOME.