Joomla 1.5.9 + VirtueMart 1.1.3 + SecurityImages 5.1.1
As some users have encounter issues with VirtueMart 1.1.3 as no captcha is displayed as default, here is a small how to. The features is a bit hidden, but it works as expected.
Go to yoursite/administrator/index.php?pshop_mode=admin&page=admin.user_field_list&option=com_virtuemart
Add a new field! (Add / Edit User Fields)