List WooCommerce products by tags

woocommerce_by_tags.php

<?php
/**
 * Plugin Name: WooCommerce - List Products by Tags
 * Plugin URI: http://www.remicorson.com/list-woocommerce-products-by-tags/
 * Description: List WooCommerce products by tags using a shortcode, ex: [woo_products_by_tags tags="shoes,socks"]
 * Version: 1.0
 * Author: Remi Corson
 * Author URI: http://remicorson.com
 * Requires at least: 3.5
 * Tested up to: 3.5
 *
 * Text Domain: -
 * Domain Path: -
 *
 */

/*
 * List WooCommerce Products by tags
 *
 * ex: [woo_products_by_tags tags="shoes,socks"]
 *
 * Updated a bit by Bruno Kos,  http://bbird.me/
 */
function woo_products_by_tags_shortcode( $atts, $content = null ) {
  
	// Get attribuets
			extract( shortcode_atts( array(
			'per_page' 		=> '12',
			'columns' 		=> '4',
			'orderby'   	=> 'title',
			'order'     	=> 'desc',
			'category'		=> '',
			'tags'          => '',
					), $atts ) );
	
	ob_start();

	// Define Query Arguments
	$args = array(
			'post_type'				=> 'product',
			'post_status' 			=> 'publish',
			'ignore_sticky_posts'	=> 1,
			'orderby' 				=> $ordering_args['orderby'],
			'order' 				=> $ordering_args['order'],
			'posts_per_page' 		=> $per_page,
			'product_tag'           => $tags, 
		'tax_query' 			=> array(
				array(
					'taxonomy' 		=> 'product_cat',
					'terms' 		=> array( esc_attr( $category ) ),
					'field' 		=> 'slug',
					'operator' 		=> $operator
					
				))
		);
	
ob_start();

		$products = new WP_Query( apply_filters( 'woocommerce_shortcode_products_query', $args, $atts ) );

		$woocommerce_loop['columns'] = $columns;

		if ( $products->have_posts() ) : ?>

			<?php woocommerce_product_loop_start(); ?>

				<?php while ( $products->have_posts() ) : $products->the_post(); ?>

					<?php wc_get_template_part( 'content', 'product' ); ?>

				<?php endwhile; // end of the loop. ?>

			<?php woocommerce_product_loop_end(); ?>

		<?php endif;

		woocommerce_reset_loop();
		wp_reset_postdata();

		return '<div class="woocommerce columns-' . $columns . '">' . ob_get_clean() . '</div>';
	}

add_shortcode("woo_products_by_tags", "woo_products_by_tags_shortcode");

Hey, I'm using this plugin in my woocommerce website.
I had to add this: global $woocommerce_loop; on line 58 to the plugin work properly.
Doesn't you have also ?

thx for the update