Hello Commanders!
nVidia's latest driver (347.09) has caused issues with Oculus Rift support for the game, so we advise you to not download this currently, or roll back your driver update if you have already done so. Nvidia are aware of the issue and we are communicating with them in regards to this, so hopefully this will be fixed soon. In the mean time though, playing of their previous driver update should allow you to continue playing like normal.
Thanks, Ashley