This is a bug I noticed a while ago and thought was fixed, but it just reared its head again.
Post scheduling in general works fine for me. However, it seems that if I schedule a post and then make a change to it in the last hour before it's scheduled to be published, it will miss the schedule.
I just had this happen to a post on my blog. 14 minutes after it was supposed to be published, it still had a status of Scheduled and wasn't appearing on the site. I needed to revert it to Draft and then publish it manually.
Anyone else seeing this? I noticed some older threads about scheduling issues but I think this is a specific case and not necessarily related.