I'm working on virtuemart install of my client version "Your VirtueMart version: VirtueMart 1.1.7 stable"
There is a bug in ps_checkout.php, display_address function. Function takes a $address_type as a param but when building SQL you have hard coded address type as BT.
Line 747 of this file should be $q .= "AND address_type='.$address_type.'";