Please use this thread for discussion specific to the Release Candidate (RC) branch on Steam, when it's available in the weeks leading up to a release. The preferred method of reporting issues in that build is the Feedback Tracker. Thanks!
Is this what you're talking about? If so, turn off Antialiasing-FXAA in your NVidia Control Panel. Also, I set the Antialiasing - Setting to 'Application-controlled'. Then turn on the FSAA in ArmA3.