So I tried to log into a multiplayer server. It all worked fine, I joined an squad it was all great.

After downloading the mission briefing, the game went black and a message showed up: Unable to get WastelandHud. And there was an Ok buttom which I pressed.

Then i realized that the game worked. But without video. If I clicked the LMB, the character would shoot and i could hear the shot. When I pressed ESC, I could see the game. But when I closed the menu it all went black again.

I connected to another server, and the bug didn't happen so I guess it happened randomly.