Low lighting caused my Kinect to fail to identify both me and my girlfriend...to the point that my girlfriend had to go through the Kinect ID twice...once because the room was dim-lit. we are both light skinned and in serious need of beach time. It's definitely not a dark skin/light skin issue... It was a low-light issue... and the fact of the matter is that darker skin in a dark room would just be less contrasty for the camera. Turn on the lights people!