All exports from Aperture appear as a solid black image
I am having issues exporting photos from Aperture - any photo export I make turns out solid black.
I have been using aperture for years with no problem - and all of a sudden I am having issues today. Whichever way I try to export - whether it is file and export, or sharing through facebook - the image comes out a solid black. An additional (related) issue is that when I edit a photo (crop, cimple color adjust etc.) the image then appears the same solid black in the browser. If I double click on the image I can see it again (most of the time - there are a couple I am unable to see).
I took the shots with my Nikon D7000, imported them to my iPad, and then into aperture (which has always worked in the past).
I have run all updates on Aperture, my mac, and checked other forums but can't find any solutions.
Is anyone else having this problem?
Aperture 3, OS X Mountain Lion (10.8.4), iMac