Build 1108 beta DX11. None of the Vsync options work. Even the Nvidia control panel can't force it, whether Vsync is set for all games, just RF2 or both. I have tried all permutations of Vsync options and it simply will not work on my GTX1080, Win 10 x64, latest drivers. Dropped back to DX9 and all Vsync modes now work fine.