Dippsy is limited to displaying 5 products.

Both in the back-end and front-end display Dippsy will not display more than 5 products to users. This is because disppsy_queries.php:6
return get_posts( array('post_type'=>'dippsy_product','post_status' => 'publish','posts_per_page' => -1));
should be
return get_posts( array('post_type'=>'dippsy_product','post_status' => 'publish','numberposts' => -1));