Hi, suddenly my photos from my canon 5d mk2 are not showing when importing to lightroom. the photos are on the card and when i view them on my EOS digital drive i can see them. If i duplicate them on the card and try again i am able to see and import them into lightroom. Only the duplicates show in lightroom. i have tried another card from a different canon camera and they show up ok. I have also tried 2 cards so it is not the card at fault. My mac has recently updated the operating system but has been ok for the last week or so. Please help.