open this PHP file:
/templates/YOUR_TEMPLATE/html/com_virtuemart/cart/default_pricelist.php
look for this line:
$SelectShippingAjax = "jQuery('#selectshippingContent').load('". JRoute::_('index.php?option=com_virtuemart&view=cart&tmpl=component&task=edit_shipment',$this->useXHTML) ." #shipmentForm')";
and replace it with this:
$SelectShippingAjax = "jQuery('#selectshippingContent').load('". JRoute::_('index.php?option=com_virtuemart&view=cart&tmpl=component&task=edit_shipment',$this->useXHTML) ."')";
and everything will be good to go.
(if you click the "Select Shipment" icon without entering any shipping address, Virtuemart will give warning of "Please enter your address first" and shows the "user registration fields")
regards.
Support