I have a SONY RX10 M4 camera and am using a 256GB SanDisc Extreme Pro 95/MBs SD card. I recently returned from a trip to Europe and downloaded the photos I had taken to my computer for editing (using Picasa). I did not edit the photos on the SD card, only the images downloaded to Picasa. I did rearrange the photos on the card, putting them into folders and naming the folders.

Now, for some reason, I cannot view any photos on the camera. Not just the ones from Europe, but all of the photos on the card (1000's). When i take a new shot, I can view that photo, but no others. When I put the card into a reader, I can view all the photos on the computer. I tried moving the photos from the card to a file on the computer, re-formatting the card, and re-entering the photos on the card. No luck.

Any ideas? Many thanks! --- Greg