I'm running LR4, and have experienced many (500+) photos classified as 'missing or offline'. I can clich the '?' in the thumbnail and it will lead me to the image which can then be restored. Can you tell me why this is happening and is there a way to retrieve these 'missing' images as a group? What should I avoid in the future to prevent this from happening? I seem to have the same workflow now as I had with LR2 and 3. I did not find this problem with them.
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