how was your solution? i have the same problem. i have already updated arma 2 to beta 95883 and dayz to 1.7.2.5. My Server have the same versions, but i and my friends are already get the "bad version" error :( i use six launcher and dayzcommander.
Server: DE 721 Time: 23:10 MEST What happend: All players were teleported to one location and killed immediately. All vehicles and tents were also destroyed.