I run using win 7 ultimate 64, i7 930 cpu, 12 gig ram, xfi platinum, evga 680gtx classified 4gig.
This person has also reported the issue and its exactly the same problem that I am suffering from and he has uploaded a picture showing what its like.
http://feedback.arma3.com/print_bug_page.php?bug_id=3289
If you need any more info or need me to test a tweak or fix for said problem please dont hesitate to ask.