cool story bro I have same problem. After reading the patch notes, I updated with sixplayer, then experienced what you described. So I uninstalled DayZ mod with SixPlayer and reinstalled it. Same symptom. So then I manually deleted the steamapps\common\arma2oa\dayz folder and reinstalled the latest version using DayZ commander. Same problem. Both DZC & SixPlayer are telling me I am running version 1.7.5.1 but I can't connect to any DayZ 1.7.5.1 servers, including my own. Awesome.