I havent had this happen to me yet and maybe im not thinking straight but I have a Nikon D90 and the card I have is a Sandisk 4GB Extreme lll . But recently its been shooting 2 shots at a time, not the shutter opening twice but on the card the same image shows up twice. The weird thing is, it will not show up when the card is in the camera but only when it is in the computer. Does anyone know how to fix this? Is there a setting I am missing here? Please help