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I'll just copy & paste what I wrote on Reddit: Hey guys it seems may have the same problem I had. The Game freezes at a black screen with a loadingbar. My solution was to get the latest ARMA beta patch and install it (after you go trough all the steps you're told to everywhere else). You can get it here: http://www.arma2.com/beta-patch.php/ During the install it had an cd key error wich didn't matter. Then start your six launcher and make sure to join a server with the right patch version on it. in this case 94444 looks somewhat like this: http://imgur.com/bpA0m It solved the problem for me. Maybe a little mor information: I bought ARMA2: CO on steam and installed DayZ with the SixLauncher.