Since upgrading to El Capitan, I’ve found I have iPhotos, Photos and Aperture in my Dock.
When I opened iPhoto, I noticed that a good number of the iPhoto photos are no longer clear, in fact they are al but worthless, though the thumbnails look fine. Has upgrading caused this? Is there a way to salvage them? And if I trash the iPhoto library, does it trash the iPhotos files in Aperture?