Carbonite has been broken since patch 6.0 was released, the author issued a statement saying the project will be fixed and completely functional for Warlords of Dreanor. Blizzard changed some of the map I.Ds for things in WoD (ex. Nagrand, cant go 2 nagrands and carbonite displaying the BC version)
So the author will have to hash out some of the fixes with the new ID's. He has given no ETA on when the project will be completed so I would suggest heading over to
http://www.carboniteaddon.com/ and checking for any updates or forum posts.