I just found that I have a one project in my library where most of the raw master files (NEF) are missing. The project contains 160 photos, but only 14 masters are present and these are randomly distributed in the project (not sequential files). My entire library is managed (not referenced). All photos were imported at one time.
All the edited versions appear in the browser with no problem, including the "full" version and the Quick Preview ("P"). Oddly, when I press "M" to view the master image, it displays correctly with no adjustments, but the message "Master Image not Found" appears where it would normally say "Master Image." I only noticed the masters were missing when I tried to export a version and got the follwing message:
"Versions with unavailable master files cannot be exported. The selected master image is either offline or not found. Please reconnect it and try again."
I searched in the library and vaults for original the filenames, but they do not exist in either location. If all the masters were missing, I would have concluded that I imported that project as a referenced file and later deleted the masters, but 14 of the 160 are still there.
I have two questions:
First, does anyone have any idea how the master files could be deleted so I can avoid this in the future? I am beginning to think this is simply a corruption of the database (not reassuring).
Second, is there any way to recover the versions that clearly exist in the project so I can reimport these as masters? While viewing them in the browser, I can zoom in to the original resolution on both the master and the edited version, but can't perform any further edits to the image (although I can add metadata). I'd be happy to retrieve a JPEG version, even though it appears I have lost the original raw file.
By the way, I have already performed all three library repair options on Aperture launch (Repair Permissions, Repair Database and Rebuild Database).
Thanks for any help,