Windows 10 user here. Getting the same issue, as well as a couple of other people on the Discord server. We think it's probably a problem with the way BattleEye was integrated, partially because I briefly saw a message that popped on the screen too quickly for me to read anything but "Battle Eye", and also because there's something up with the launcher executable itself. Currently verifying the game files, which is going to take a while considering it's 70 gigabytes. If that doesn't work, I'm probably going to go with the suggesting people have made here to delete the BattleEye folder and repair the install from there. I'd rather not have to reinstall the whole game though, because that's going to mean finding a time I can leave the computer on for several hours while I'm not using it. I think the worst part is that I don't even care about PvP, and generally don't get along with what PvP-focus seems to do to the player base, so I didn't even care about the anti-cheat...