With the latest driver it is working again (with my new RX480). I tried to define custom resolutions (21:9) with this method : http://forums.guru3d.com/showthread.php?t=397985 ...And it works like a charm. I'm really happy with the result, the paul ricard track looks wide as it should. By the way you can define whatever you want. I defined a custom with 3880x1350. It works well with RFactor 2 but it does not with AC or Pcars, they always try to use the full screen and introduce a distorsion.