I do love the ease of use of this, but I am now experiencing a problem on checkout.
I use the "No Registration Profile" and when a user is going to checkout they are now brought to a form where they enter first name, last name, email, and country.
When they click "Save" on that form, they get a blank page with the following error:
 => Array
[message] => Username and password do not match or you do not have an account yet.
[type] => warning