I dont really know why this bug appeard and when.
I already had it but it just suddenly disappeard sometimes.
whenever i host a game, nothing happens for about 5-10 seconds whats longer than usal. then a black window opens but instead of a connection message i just see my ingame mouse and a blackscreen.
when i press alt+f4 the ingame window pops up if i want to leave so it seems like the game is not just crashed.
if you need some logs tell me. Since it doesnt seem to be a connection problem i wont post them right now.
and as said, the bug already disappeard for a time for no reason. now its back for apparently no reason