Im having the same thing also had it in the 0.50 stable.
Searched the whole net for a solution tried everything...
When in the main menu there is no problem and also no problems ingame but when i go to the server browser i gotta pick a server fast cause it crashes to desktop else and says DAYZ.EXE has stopped working...
I can also note that when the crash occurs like 1 or 2 seconds before the menu music skips a bit