I have a site running 3.7.1 where posts are sporadically failing to post on schedule.
Unlike the "missed schedule" error that sometimes occurs, these misses don't generate any notification and the posts are not flagged in any way.
In the posts that have failed to publish, reviewing the settings shows that WordPress shows that the posts are still set as "scheduled" despite having a date that is in the past.
One thing that is unique to this site, compared to other WP sites that I've managed in the past: there are over two months (60+) of posts scheduled for the future at any given time.
Other possible causes seem to be plugin related. I am running W3 Total Cache on the site. I have tweaked the settings extensively and disabled the plugin but I have still seen the error, so I am skeptical there.
Has anyone else encountered an issue like this?
p.s. I am currently testing the WP Missed Schedule Fix Failed Future Posts to see if that resolves the problem.