I have this problem as well. Deactivating other plugins did not help. Page source code shows the favorite post links are inserted in the header before the meta tags. Also shows up in the content as it should.
I tried changing {{wp-favorite-posts}} to [wp-favorites-posts] but then no favorites appeared at all.
I’m using the latest version of WP 3.4.1. WP Favorite Posts version 1.5.6
