Originally Posted by
BLiNK i had this same thing happen about a week ago. repsrings and reboots did not matter. then i was syncing my device one night, plugged in, and they all came back and have been since then
i have no idea why this worked just glad it did
Yeah, this just seemed to resolve on its own... creepy

I don't have gridlock installed but after the above poster mentioned this app, I recalled that I actually have purchased it and had it on my 4.2.8 JB just never re-installed. So, I'm confident the culprit is narrowed down. If tincture of time or some iPhone gremlin fixed the issue, fine by me... just always nicer to know what actually caused the problem when possibe...
Thanks to all for the feedback!