Nicholas86 sent me the file. I had a hard time rendering it (because I wanted to render it in two seconds) so I kept turning things down/off until I could get it to render very quickly. It turns out that the sky atmosphere plane is cutting through your scene. I'm would hazard a guess that you could turn it off and still get the effect you're after. Not totally sure though. The render above is an extremely turned down revision of the original file and you can see everything in the mirror now. Weird but glad it could be figured. This is a neat setup and I hope you can achieve what you're after without the sky atmosphere turned on. -Kix

-Kix