I have been using the Sandisk Ultra SDHC Class 4 8GB and it worked fine, but it takes a couple seconds for it to record the picture after I have taken it. I just bought the Sandisk Ultra SDHC Class 6 8GB and the camera says that it is not formatted. It does not work for some reason. Both the cards are exactly the same, except my newer card is Class 6. Does anyone know the problem or have the same one?