I had to crawl under my desk yesterday night to organize some cables. And when I looked up, I noticed there is some light shining though a gap between the display and aluminum case. It's hard to explain, but the gap is behind the screen, and it is around FaceTime camera. I guess the display is not perfectly attached/glued around FaceTime camera...? Is this normal? My iMac is late 2012 21.5" model. I'll post a picture soon.