Please help. My GF1 has displayed an error message " This picture cannot be displayed" most images were replaced by a white exclamation mark on a blue background. Luckily the lost snaps were only messing about around the house for something to do. The images on another card worked fine, as did the original after I had re-formatted it although of course the original images had been lost. I quite expect the info is in the manual but I can't find it.