Aperture 3.6: cannot see images in viewer or split image mode
I installed Aperture 3.6. When I click on any library project I can see the images in the browser or at the bottom of the split view. But at the top of split view the screen in gray. In the Browser, when I double click an image usually the image opens full screen - but now I only get a gray screen. I have checked that there are no filters in effect. My images are all referenced and all are on the hard drive on my computer. This only became a problem a few days ago - until then everything worked as it should. Thanks.
Aperture 3, iOS 8.1, MacBook Pro