I found a semi-reliable work around.
I had narrowed this past blackscreen issue to a specific friend it was occurring with. All my other coop friends did not have blackscreen issue.
I am not in front of that computer at moment, but I navigated to the Larian Studios folder that had my config settings/user profile. (My Documents folder?) I then renamed that folder(added a "2" at the end of it) and relaunched game. It created a new folder that still had the name of my profile in it, and my saved games, but it reset all my controls and other Options/Settings.
I am now able to launch coop games, BUT....
I still get the black screen, but you have to let it sit there anywhere from 1min or longer, and then the intro movie starts to play. When the intro movie starts, just hit Escape to skip the movie and get the game loading as fast as possible. You should be able to load in and have no further issues.
You also might get another blackscreen that just never loads. But after extended testing, this method works the majority of the time. But see the next factor below, that might also play a role:
One possible additional factor, or perhaps an issue in my headed that I did not get further testing on:
When all your friends are creating characters, do not let any of them hit the Start Game option at the bottom. When everyone is ready, the Host should hit Start Game, and once Host is on waiting screen, everyone else should hit Start Game immediately.
My friend that was causing this blackscreen issue, would always eventually get Disconnected From Server(I think was the verbage) on the blackscreen if he hit Start Game button before the Host was ready.
Hope this helps
Last edited by Showzen; 09/09/18 01:15 PM.