I have messed up somewhere and cannot transfer my pictures from the SD card to my computer. Lightroom indicates the pictures are on the card but the preview is not available. Pictures taken previously are viewable/transferable. I'm sure I've messed up somewhere is the settings. Can anyone tell me what I did wrong in the set up to cause this? I can read the card so it isn't the card. I can view the pictures in play back on the camera so it isn't the camera. What the heck!