Been working fine for me all along, I use it often. May sound silly, but are you sure you got the right url? There are several out there, this one worked for me just right now...
http://www.rcdb.com/
Favorite Wood Coasters: The Voyage, Ravine Flyer II, Thunderhead, Balder
Favorite Steel: Voltron Nevera, Steel Vengeance, Expedition GeForce, Olympia Looping
Parks visited: 232, Coasters Ridden: Steel: 894, Wood: 179, Total: 1073