the recent section in the aperture library isn't working
The recent section in the Aperture library is supposed to contain the last few months, the last import, the photo stream, etc. My recent section has started to have a mind of its own. The first item is a project from several months ago. I can't delete it, or move it, or do anything with it and I don't want it there. The second item is supposed to be Last Month. It is empty, although I've imported hundreds of photos in the last month. Also, when I change the preference for the range of months, nothing changes. Last Import is also empty. Photo Stream, Flagged, Rejected and Trash all work fine. How do I make this section work? This is completely flaky. I've tried trashing all the Aperture preference files to no avail. This was happening in Lion, but upgrading my system to Mountain Lion and Aperture to 3.3.2 didn't change anything. Help!
Aperture 3, OS X Mountain Lion