This thread is a dupe, see here: http://forum.pfsense.org/index.php/topic,20101.0.html
In summary: the link from /usr/local/captiveportal to /var/db/cpelements is missing. I tried to re-create it, but was met with a read-only filesystem error, probably because I'm running live-cd. I hope the devs have a suggestion.
Mike