WP-Cron doesn't work on my installation. I can manually force tasks to run using a plugin like Core Control, but they don't run by themselves. I'm visiting my site regularly during development, so it isn't an issue of traffic. I've updated permissions on wp-cron.php to 755, as I found suggested somewhere. I'm running a LAMP stack on CentOS 6.5. I know there are plugins available to replace WP-Cron, but I'd really like to get the default system running if I can. Any ideas?