make sure you're joining servers with YOUR correct version of DayZ. i was having this issue the last few days, particularly trying to join the server where i have my camp set up with all my gear. i got killed in another server, tried going back to my camp server, and would get as far as the black Loading screen with no bar. i tried waiting it out for 30 mins one time. then it hit me, maybe the server updated. sure enuff, the server was running 1.7.2.5, and i was using six launcher with version 1.7.2.4. updated to 1.7.2.5 and got in no problems, no waiting, no stuck loading screen.