I am working on cleaning up my Aperture libraries and merging duplicate libraries or others which should be. I opened one of the year 2008 images after upgrading the library as needed, and got what you see below. I have reprocessed and done all the usual troubleshooting. Before I import a possibly duplicate library to this one, I'd like to clean it up. I don't mind, even, exporting the images and starting fresh but would prefer not to lose the work done.
The library has 14,785 images and is approximately 12G in size. When I put it in Photos view and list of photos this is what I get:
so each is taking up MG of space but they're not showing anything - when I click on one it opens to a black screen.