That, or they just don't work very well. I'll test them again this evening and see if an extra day in the freezer made them extra cold. At worst, they make a great conversation piece in a drink, even if they don't radiate as much cold as I would like.
On an unrelated note (unrelated to the rocks, not the picture) I took this one with the old camera. I find that for action shots, and carefully composed shots like this it seems to do a better job. The new camera does some nice images, but it's hard to beat decent SLR lenses.
pierrekrahn and his waterproof camera.
If you are going to test the manufacturer's claim about the camera you bought a couple of hours ago being waterproof, you may as well order a big glass of ice water in a restaurant and just drop it. Best to check theses things while the camera is still under warranty.