Can't Play DayZ On Two Comupters In Same House

[ABigDumbOgre 0]

Both myself and my brother have separate steam accounts, both own Arma2 and Arma2 CO and both have installed the DayZ mod and are using the SixLauncher. However, when we both attempt to play the game only my brother can get into a lobby; my game just loads, shows a blank screen then reloads and sends me back to the main screen. Is there any reason for this, and any way to fix it?

Steam Version.

No Beta Patch that I know of, but neither does my brother and he isn't having issues.

Sixupdater.

Cannot connect to a game while my brother is playing on his computer and am not given an error message as to why.

Good enough specs.

Windows 7.

Yes.

[ABigDumbOgre 0]

This has been resolved. It was related to a separate issue where the BattlEye folder did not auto-create itself in the ArmA 2: CO folder, just the original ArmA 2 one.