The block item rotation (with or without shuffle) is not working.

Steps to reproduce

1. Install Community Project v.2012.05 with ezdemo extension and content
2. Setup the cronjob for ezflow
3. Login to the admin interface and edit the home object
4. Set a rotation for the second block in the left zone (content grid - mixed content)
5. Wait a moment or execute ezflow cronjob manually
6. Check the start page, nothing will happen