I was checking out your Tabbed Products ''LITE'' demo site and on this page (http://www.unbannable.com/zen/index....&products_id=1) at the bottom is this message:

Fatal error: Unknown function: zen_update_user_tracking() in /home/unban/public_html/zen/includes/templates/tvc/common/tpl_footer.php on line 69

--------
Just thought you would like to know this.