Hi,
Thanks. I think it comes from the last update we did to the PDF invoice plugin, combined with the use of HikaSerial.
Edit the file plugins/hikashop/attachinvoice/attachinvoice/invoice.php via FTP and change the line:
$app->triggerEvent('onAfterOrderProductsListingDisplay', array(&$order, 'order_back_invoice'));
to:
$mode = 'order_front_show';
if(hikashop_isClient('administrator'))
$mode = 'order_back_invoice';
$app->triggerEvent('onAfterOrderProductsListingDisplay', array(&$order, $mode));
It should hopefully prevent HikaSerial from trying to load the wrong view file.
Let me know how it goes so that we can include the patch on our end.