Do you have a backup of your Aperture library from the time before you made the upgrade?
It seems Aperture cant find the original master files or the managed files that the previue is refering to.
I still do not see, how you imported your images. Did you store the original masters inside your Aperture library (managed) or does your Aperture library reference the originals in a folder outside your Aperture library?
If you reference your originals outside the Aperture Library, then you can try to reconnect them:
- Select the images with missing originals in the Browser.
- Then use the command "File" > "Locate Referenced Files" to point Aperture to the missing files; see this page in the User manual: Reconnecting Missing or Offline Referenced Images
- To quickly find all referenced files that need reconnecting, create a smart album (File > New > Smart album) with the single, added rule: File Status is "missing" (or offline).
If this does not work, because you have managed originals, inside the Aperture Library, look for your originals in the Aperture Library Package. Select the Library in the Finder and ctrl-click, then select "Show Package Contents" from the pop-up. In the Finder window that opens, navigate to the folder "Masters". Your missing images should be inside; the folder is structured by date of import.
Copy, don't move, the images you want to rescue.
It might be simpler, to start over with a previous backup of your Aperture library. If you have one, post back.
Regards
Léonie