The current pre-release of the client ("pioneer" in the version) is only compatible to itself. So you can only play with other testers. Please be aware!
Black screen when i try to connect to the game
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And also if I try to run just SupCom from Steam it's also just a black screen (yeah i tried to just click a few times, it doesn't help). Here is a log when I tried to connect to some game from FAF:
game_19855108.log
I checked an integrity of files on steam.