Kathy,
That's interesting about Frommer's, because it was the Frommer's site that first got Capricorn a lot of Internet publicity about its good deals.
I don't have any personal dealings with Capricorn but I have been told that they have low rates, and I have seen on the Internet a number of positive postings about the deals people got.
You could check with the Better Business Bureau in whatever city they're based in, and as Jim suggests, call the hotel or hotels you're booked with and confirm that your reservations are ok.
--Lan Sluder
Belize First Magazine
http://www.turq.com/belizefirst/