Timely WP Favorite Posts plugin

I was using the WP Favorite posts plugin (http://ww.wp.xz.cn/extend/plugins/wp-favorite-posts/) with this calendar plugin and it worked perfectly until the calendar upgraded to 1.9. Now, when I click “add to favorites” on a calendar post, it says “Added to favorites!” but does not appear on the favorites page.

Anyone else experience this? Or have any suggestions? I really need to get it to work…

http://ww.wp.xz.cn/extend/plugins/all-in-one-event-calendar/