It's been reported a few times before for the earlier builds. HDR lightning is not stable (for me), AMD phenom 4 and HD4850X2. But after alt tabbing before the race session starts I get a stable lighting and can enjoy rFactor2 in all it's beauty. It does not matter what settings are used in rfactor2 or in the catalyst driver (12.6) or what crossfire profile I use, alt tab does the job. Maybe it's a clue to solve the issue in the next build. (please!)
