Well after playing around with this a bit I have determined that Joomlaboard 1.1.2 is not completly compatible with CB RC2.
(Maybe I am missing something?)
I installed 1.1.1 and everything seems to work fine.
The issue is that if an anonymous user clicks the reply button they will be directed to a page with a link to register. The register link will not send them to the CB Registration form but instead sends them to the Joomla registration form.