I go to boot the game up, it goes through the loading process and comes up with:
No entry 'bin\config.bin/GfhInGameUI/MPTable.shadow'.
And then:
Error compiling pixel shader PSSpecularAlpha:0
I had similar problems with normal ArmA2 but fixed it by running steam as admin, right clicking, properties, choosing local files and clicking Verify Integrity of game cache.
This fixed my normal ArmA2 game which now works, but still having issues with OA.
Greatly appreciate any help and sorry if there's a thread elsewhere for this but I couldn't find it :/
Thank you in advance.