I am using a USB card reader to download images to LR4. When I plug the reader into the USB port I get an error message saying, "images on card do not meet download criteria". The thumbnails appear in Library mode but when I click on "Import", another error message appears saying the files could not be read.
As recently as last week I successfully downloaded images from the same card. As usual I reformatted the card before going on today's shoot. Does anybody have any idea what might be going on here? Thanks