I just deleted the battle eye .dll file at C:\Users\[your name]\AppData\Local\ArmA 2 OA, and also deleted the entire beta folder and reinstalled the beta patch. Then ran ArmA 2 OA to have it update Battle eye itself. (if you get the "WRONG CD KEY" error when trying to install the beta patch again when doing this, just load up ArmA 2 OA once and log back out to correct it) I am finally able to enter games now. Note: I am on the steam version and do everything manually. I don't bother with the SixLauncher.