Hello! I'm having some problems with Aperture. If I make an edit in Nik software, for example in Dfine, and then make an edit in Silver Efex, the Silver Efex photo seems to over write the previous edit, so I only have one edited photo in my library. It used to save each photo separately after each edit. To try and make this clearer, I edited in 4 plugins from Nik, but I only have one edited photo version in my library. I'm in a position where I was happy with a photo I edited, but then sharpened too much in sharpener pro, and now I can't go back to the previous edit! Does anyone know what's happened? Is it an option I may have changed by accident in Aperture? Thanks guys.