It may have to do with the transfer of my photos from C- to D- drive. It suffices to read the back of my backup. I have more than 28 000 photos, which were provided with keywords . There are only 600 left.
How did you move the photos?
Are there any '?' on the folders in the library?
Watch this: http://laurashoe.com/2012/05/03/running-out-of-space-how-to-move-photos-to-another-hard-dr ive/
Retrieving data ...