When using NVIDIA driver v275.33 or previous versions, users have encountered problems with 3D Vision eye synchronization when playing Crysis 2 DirectX 11 mode. When playing the game, only the left eye image has new frames displayed while the right eye image may stay static.
NVIDIA has fixed this problem in NVIDIA Beta driver v275.50 and higher. Please download these new drivers to address this problem with Crysis 2. You can download new drivers here: http://www.nvidia.com/Download/Find.aspx?lang=en-us.