I have a site that when the checkout button is clicked the URL doubles up for some reason.
It ends up looking like
http://www.sitename.com.auhttp//www.sitename.com.au/index.php?page=checkout.index&ssl_redirect=1&option=com_virtuemart&Itemid=56
Running Joomla 1.5.23 and Virtuemart 1.1.9
Obviously a bug somewhere that I cant find.