This is my first report, but I play since 0.28 =) I hope it will help devs !! I don't really know what to do, but I will do what I can ;-)
It happened to me with the latest update. When I play DayZ, very often the game freeze and then go black. My character still in the game and I'm able to move, but I cannot see anything !!! Even the menu ! I'm totally blackened.