Hi Peter, I can't say enough good things about the Sandisk Ultra II cards. I have a 1gb, and it works like a charm. I also have another 1gb from a different manufacturer. I bought it in an attempt to save money. But it doesn't work correctly now either. I bought it on EBay, so I lost money instead of saving it. But the Sandisk Ultra II cards are great. Have you tried reformatting the Kingston on your computer? I think I did that with my Kingston 512 MB card, and this solved some of the problems I had with it. Angie