[Plugin: Yet Another Related Posts Plugin] Custom post types not showing in Yarpp 3.5.1

Dear Michael,

I’have the option set in the yarpp settings to display custom post types and I call the plugin directly from within my “single” template with: related_posts();

Still nothing shows…

Permalinks and Yarpp have been saved again and cache is cleared.
Yarpp version 3.5.1
WP 3.3.1

http://wordpress.org/extend/plugins/yet-another-related-posts-plugin/