WP 3.0.5 Missed schedule

I use WordPress 3.0.5. My problem looks like in this image:

I try same solutions:

1. Go to wp-includes/cron.php and change properties (solution from http://www.shoutmeloud.com/wordpress-missed-schedule-problem-solved.html). This don't worked form my site.
2. I solved problem with plugin http://wordpress.org/extend/plugins/wp-missed-schedule/