No, that is not the case with Carbonite.
The only thing different between non Carbonite supporters and Carbonite supporters is access to the "Carbonite: Supporters" forum.
EVERYONE (except the devs, of course, if they are working on something and it's not ready for general release) gets the same Carbonite.
A possible explanation and a "quick fix", that you can apply yourself to Carbonite for this problem, can be found here:
http://www.wowinterface.com/forums/s...ad.php?t=41866 Which, ironically, is in this same forum, and only one other thread separates that one from this one.