Hey blankbeard,
Thanks for reaching out to us!
This is a bug within our plugin that is set to be resolved with the next update of our plugin. In the meantime, the issue was due to the hook which controlled this being unintentionally removed so you can fix this by adding both the:
add_action( self::CRON_HOOK, array( $this, 'clean_up_old_recurring_events' ), 10, 0 );
remove_action( self::CRON_HOOK, array( $this, 'clean_up_old_recurring_events' ), 10, 0 );
to the “lib/Recurrence_Scheduler.php” within the PRO plugin like this https://cloudup.com/c3_mM58Numt and it should be back running.
Let me know if this helps.
Thanks!