I had this issue as well on another server.

I managed to resolve the issue. Used the new patch that Eugen mentioned on twitter and it fixed my stable and experimental launching issues.

Hello Devs. I was able to get standalone working on one machine but not the other.

Would you like a dxdiag dump from either of those machines?

Here is from event viewer on non-working machine:

Log Name: Application
Source: Application Error
Date: 2/20/2015 9:44:09 AM
Event ID: 1000
Task Category: (100)
Level: Error
Keywords: Classic
User: N/A
Computer:
Description:
Faulting application name: DayZ.exe, version: 0.54.126.545, time stamp: 0x54de2db8
Faulting module name: DayZ.exe, version: 0.54.126.545, time stamp: 0x54de2db8
Exception code: 0xc0000005
Fault offset: 0x008ff236
Faulting process id: 0x1988
Faulting application start time: 0x01d04d1bae3b7230
Faulting application path: C:\Program Files (x86)\Steam\SteamApps\common\DayZ\DayZ.exe
Faulting module path: C:\Program Files (x86)\Steam\SteamApps\common\DayZ\DayZ.exe