Wasn't quite sure how to describe this so I didn't manage to find anyone else posting about it. I'm using an original Rift (the old school one with the xbox controller). What happens is that when I watch a video everything is fine if I keep my head still and centered, or a few degrees to either side, but not if I move my head around the center of the video. The view will "snap" a couple of degrees to the left or right when my head moves over the center line of the video and I can't figure out why? It's extremely distracting, if I keep my head in the right spot the video will "vibrate" rapidly back and forth with the subtle head movements.
Any ideas? I've tried playing with the 6DOF setting. Increasing sense to max, turning each axis on and off, nothing changes.