This must be obvious, but it's driving me mad. Here's what happens:
Import a pile of pictures in a new project.
Go through them all rating the good ones (either using '/' or the number keys 1-5)
Apply a filter to only see (say) 1-* or better
So far, so good. Now I only see my picks and I can work on them.
Now when I quit Aperture, re-start and go back to this project, the filter is still there but it shows me NO images. If I change the filter to 'Show All' and look at an individual image it'll have the right rating, but the filter just doesn't seem to see it.
What's wrong? I've tried Googling to see if anyone else has this issue, but it's not the best set of search terms to try and look for.