I am using a full-size SD card. I only had one card in the camera at the time. I plugged the SD card into a card reader, then to the USB port on my computer.
I just had this same thing happen. Photographed an event for more than an hour. I was able to see the images on the back of the camera as I was photographing - all appeared normal. When I attempted to upload to the computer from the SD card, no pho...