Genesis 2.0 has special archiving support for custom post types, but it has to be set in the custom post type's settings like this: 'supports' => array( 'genesis-cpt-archives-settings' ) If you're using a plugin such as WPMU's CustomPress, there may not be a setting in the plugin to add custom support values, but you can add them with the add_po…

add_post_type_support.php

<?php 
// Add this to your functions.php file after the custom post type has been declared.
// Replace $post_type below with the post type system name of your custom post type

add_post_type_support( $post_type, 'genesis-cpt-archives-settings' );

?>