Director is unable to process work such as renewing a certificate or generating a report. Certificate renewals will stay in “Queued for renewal” status indefinitely. Reports will not get delivered or become available for download.
MySQL sometimes fails to insert a config_lock. This is a bug in MySQL reported in http://bugs.mysql.com/bug.php?id=65418.
When MySQL is required use version 5.1 or 5.6.