I've got a strange problem that just started the other day. When I right click on an image and select 'Export->Version', it doesn't properly export the jpeg version that I select, but what's weirder is that from then on - the drop-down for selecting formats is dimmed out completely. It will only export the NEF file. I relaunch Aperture, even reboot the Mac - no joy. Then several days later, the menu option comes back, although it never works; the cycle just begins again.

My first thought was to delete the Preferences, but when I go to Library->Preferences and look for com.apple.aperture.plist, *it doesn't exist*. Not there at all.

Running Aperture 3.3.2 on OS 10.7.4. Help! I can't export files for my clients!