Permanent Black screen

so, when I want to go in a room, I have a black screen which takes my whichscreen (even if I’m not in fullscreen),as if my PC wasn’t connected to my screen anymore, but it happens only when I want to connect to a room, when I alt + tab, my screen reappear…

Do you have any extensions installed in your browser? Does this happen everytime you visit a room?

For one song, the YouTube player went completely black. The iframe didn’t seem to be loading, either. These two issues may be related.

You mean one specific YouTube video? Can post the link to that video?

I have few, but I already tried without them.
Yup , everytime