Not working on Front End

I have added the orderby argument as shown in the full code registering my custom post type, below..

$args = array(
		'labels' => $labels,
		'public' => true,
		'exclude_from_search' => true,
		'publicly_queryable' => true,
		'show_ui' => true,
		'query_var' => true,
		'capability_type' => 'post',
		'hierarchical' => true,
		'orderby' => 'menu_order',
		'order' => 'ASC',
		'menu_position' => null,
		'supports' => array('title','editor','thumbnail','custom-fields','excerpt','comments', 'page-attributes')
	  ); 

	  register_post_type(__( 'portfolio' ),$args);
}

The plugin works great in the backend but in vain for the front end. Any help would be appreciated. ^_^

Thanks.

http://wordpress.org/extend/plugins/simple-page-ordering/