The solution of the shipping estimator problem with WOZ v1.5
Please edit 2 files.

includes/init_includes/init_woz.php

if (!defined('IS_ADMIN_FLAG')) {
   die('Illegal Access');
  }

if (defined('WOZ_CONFIG_STATUS') && WOZ_CONFIG_STATUS == 'true') {

to

if (!defined('IS_ADMIN_FLAG')) {
   die('Illegal Access');
  }

if(substr($_GET['main_page'],0,6) == 'popup_'){
  define('WOZ_IGNORE_FLAG', true);
}else
if (defined('WOZ_CONFIG_STATUS') && WOZ_CONFIG_STATUS == 'true') {

includes/templates/template_default/templates/tpl_modules_wordpress_header.php

if (defined('WOZ_CONFIG_STATUS') && WOZ_CONFIG_STATUS == 'true') {

to

if (defined('WOZ_CONFIG_STATUS') && WOZ_CONFIG_STATUS == 'true' && !defined('WOZ_IGNORE_FLAG')) {