thank you for this advice. I wrote a email to your support team.
WordPress 4.7.3
Plugin Version 2.4.4
Also I´m not sure if maybe an other plugin causes the problem. At the moment we are running “WooCommerce PDF Invoices & Packing Slips”. Might this interfere with the plugin? Problem is I cant make sure at the moment because the shop is live and the shop crew is working with it.