If the Player Window displays your content as grey, black & white, or split screen (either vertically or horizontally), it is likely that the "View" selection was changed to one of the other options. The View mode should always be set to Left Eye expect when working with 3D video clips.

 

For black and white video, it is also possible that the Saturation level in the Video Settings was turned down. If you did not mean to do this, just reset the Saturation by clicking in the word "Saturation" in the Video Settings.