Like many of the posts above, I too, had the same problem. I would let my game load for up to thirty minutes but I had no luck. I clicked the "Reinstall BattleEye Anti-Cheat" option for Arma2 AO, then I joined an online game in Arma 2 AO that wasn't a DayZ mod server, and then I quit out. After that I joined a DayZ server and it magically worked. I have been successfully playing all night. If you haven't done this yet and you're having the same problems as I did, try this fix. Thanks Tijg0rr, I'm finally playing DayZ again because of you...