Have you tried:
– deactivating all plugins to see if this resolves the problem. If this works, re-activate the plugins one by one until you find the problematic plugin(s).
– switching to the Twenty Eleven theme to rule out any theme-specific problems.
– resetting the plugins folder by FTP or PhpMyAdmin. Sometimes, an apparently inactive plugin can still cause problems.
– re-uploading all files & folders – except the wp-content folder – from a fresh download of WordPress.
clean overhead in database
I have the same issue mate. Please read more about it here:
http://wordpress.org/support/topic/every-post-misses-schedule?replies=1
So it’s not the theme (coz both are acting up), I tried resetting the plugin folder and I tried deactivating all plugins. It happens with ALL POSTS. I just recently updated WordPress for one of the sites (it did this before the update too) so it’s not that either. Any other ideas?
