Thread:Project:Support desk/Jobs are not executed in MediaWiki 1.23.2/reply

You can have more information reading Manual:Job queue.

Try running jobs directly with runJobs.php. If they're run successfully and there are no remaining jobs, then monitor the job queue for a day for example, and see if jobs get stuck there. If yes, then you might try to set $wgRunJobsAsync to false and see if that makes jobs being run again on page requests. If so, you might want to enable debugging while restoring that setting and let us know of any error you might encounter on the log.