I had the same issue as did Dannington on page 1. Your tracking camera isn’t working. My first attempt to unplug the sync cable and reattach a few times didn’t change anything. Then I did the full plug everything and reconnect and it started working. I did switch to the USB 2 ports on the computer which forced the oculus drivers to be reinstalled… I suspect the driver reinstall did it, but…
Win 7, DK2, .7 SDK, Nvidia 750 Ti.