I can now play DayZ Experimental with no bugs or FPS problems, but stable does not work.

I've been having this problem too. For me my game will run longer without this thing happening as long as I avoid buildings and cities, but it always ends up happening. If I'm in a city when I log on I will have this glitch the second I join. Sometimes if I turn all my settings extremely low I can kind of run around but if I'm in a building or city I can't play the game at all. If I look at my character in the load in screen I can sometimes see the arms clipping through the shirt and the horrid graphics.