functions.php

<?php

add_filter('genesis_post_meta', 'be_post_meta_filter');
/** 
 * Modify Post Meta
 * @author Bill Erickson
 * @link http://www.billerickson.net/code/genesis-post-meta
 * @link http://www.studiopress.com/tutorials/shortcode-reference
 *  
 * @param string original post meta 
 * @return string modified post meta 
 */
function be_post_meta_filter($post_meta) {
	if( is_single() )
		$post_meta = '[post_categories] [post_tags]';
	else
		$post_meta = '[post_categories before=""] [post_tags before=""]

	return $post_meta;
}