Invitation Registration Page

Hi,
I've put my settings to invitation-only.
The email sends and I receive the link (with the code at the end of the link) all perfectly fine.
The link looks roughly like: http://forums.domain.org/entry/register/CODE

The registration page that loads does not have a field labeled "Registration Code".
At first I thought that the form would pull the code from the link rather than having me fill it out, but if I submit, I receive an invalid invitation error.

I took a look at the PHP file and is it possible there is a bug that it loads the template for the basic registration rather than the invitation registration page?

Thanks