Aperture 3 does not show thumbnails

[asut]

Hello, after installing the Aperture 3, I found does not show thumbnails, tried to do everything he could, but nothing helped. I understand why there are no thumbnails, because the preview files in the Aperture library of 0 kb, ie they are all empty, but why Aperture can not do them ... Can anyone encountered this problem? Thank you.

 

[neutrino23]

Kind of puzzling. So you previously had Aperture 2 or you are starting with Aperture 3? Did you tell it to import photos from somewhere else on the hard drive? Try importing one or two more images from your flash drive to see if it behaves differently.