I just started using aperture. I made it copy my files into it's own library instead of referencing them. But for some reason there are about 5 pics that have an original and a referenced file. I try to delete the referenced file so I only have the pic showing up once. When I try to do this aperture crashes! I can delete any other pic that is in the aperture library that was copied over, just not the referenced files?!! Does anyone know why?? I really like aperture, but if it keeps crashing i'll be forced to go back to iPhoto and be out the money I spent on it!! Please help!!