Aperture Hangs on Generating Preview for an image.

The next time this happens, launch Aperture with the Shift key held down. That will defer the generation of previews. You can then try to isolate the offending image that cannot be processed.

If this problem continous to happen, you may want to reformat your card or try a different card reader. When I had a problem with unreadable image files on import, replacing the card reader helped.

It seems to be more pervasive. Importing for a file, all imports and then stalls on generating preview. Looking at activient is states "Generating preview for P1010821 (0) remaining and status shows 58 Remaining. One way to generete browsing preview is to modify an image either in split view or in viewer.

Have you trued to export the original image file for P1010821? Then you can test, if this file can be processed at all, or if other applications are also having a problem with this file.

No problem with this image or any of the others. Image can be used in or out of Aperture. It just will not create a browser preview for any imported image(s).

This is the second time this has happened to me. This time I was able to export the images (minus the one that appeared to cause the problem) to a networked volume. I'm going to try and re-import and see what happens.

Is your Aperture library on a NAS, or are you referencing your original image files to a NAS?

I'd try if Aperture can import correctly, if you create a new library for testing. If that works, repair or rebuild your regular Aperture library. After force-quitting is a library repair recommended anyway.

To launch the Aperture library First Aid Tools to repair or rebuild a library:

• Quit Aperture.
• Back up your Aperture library, if you do not have a current, working backup.
• Hold down the key combination alt/option ⌥ and command ⌘ at the same time, while launching Aperture. Keep holding down the keys firmly, until you see the First Aid panel.
• Select "Repair database" from the panel. This may take a long time for a large library. Don't interrupt it.
• If Repair does not suffice, do a Rebuil as well.