A while ago, when I first got my nexus 4, I tried out face unlock. It worked perfectly fine, everything was normal. Recently, I noticed the portion for fave unlock isn't there anymore. It definitely had been, but now its not. The only thing I can think of that I might have changed is enabling developer options, though I am pretty sure I used face unlock with them enabled. I tried turning developer options off, but that didn't help. I am running 4.2.1. Has this happened for anyone else?