First we have Google testing moving down the local pack and yesterday, for a few hours, the local pack went missing completely.
I saw complaints across Twitter, Google Business Help & Google+. By the time I was alerted to it, maybe an hour or so later, the local pack was working just fine for me.
I assume it was a limited bug where it disappeared for some over a few hour time period. But as you can imagine, that would be scary for any local business or local SEO. Here are some of the reactions:
And indeed, they are back. I personally was never able to replicate it, so it likely was not fully widespread but many were able to.
Forum discussion at Google Business Help & Google+.