[Plugin: Ada WPMS Sitewide Feed] This plugin work fine with page but not with post

Hi! I have a problem.
For me feed for page work fine
http://www.scheggedicristallo.com/?wpmu-feed=pages
But feed for post seems empty
http://www.scheggedicristallo.com/?wpmu-feed=posts
Can you hel me?
Thanks

http://wordpress.org/extend/plugins/ada-wpms-sitewide-feed/