I updated to the 4/16 nightly this morning and it's been causing all of kinds of problems for me. I went into SafeStrap (3.11), wiped system, cache, dalvik, then reinstalled the 4/16 thinking it might fix it. That didn't work. So, I wiped system, cache, dalkvik and installed the 4/15 nightly. That didn't work either.
I wiped ROM slot 1 and am currently re-creating it. I'll install 4/15 back into it along with GAPPS 3-3-13.
As a side note, I haven't decided if I'm going to update the stock side or not. I've been using CM10.1 for my daily driver for months now. If I'm reinstalling this stuff on my SLOT 1, would it be a good idea to go ahead and update the stock side to 4.1.2 or just wait and it later?