Some multiplayer games get stuck at a black screen

[wrkncacnter7]

A lot of multiplayer games have been getting stuck at a black screen lately. It doesn't seem completely random, as certain people joining certain hosts can reproduce the issue every time (or just about).

For example, if I host, most of my games work fine unless one specific person joins the game. Then there's a extremely high chance the game will get stuck at a black screen, and everyone just has to quit out of the game. However, that person can join other players games just fine, and I can join his games when he hosts without any issues. Many other people have been reporting the same issues where the game never works if they join certain people's games. but they can join other people's games just fine.

Apparently in some cases, people are unable to join anyone's game without it getting stuck at a black screen, and then they pretty much can't play multiplayer at all anymore.

I don't see any relevant information in the logs when a game gets stuck at the black screen. Is there any way to turn on more logging or a way to debug this to get more information? It's making the multiplayer experience really bad. I used to play years ago, and don't recall games failing anywhere near this rate in the past.