I am a new iMac user. I recently bought Elements 15 from the app store. There were a few problems with a crashing editor, but that was solved with an upgrade. My problem is that the organiser is so slow it is unusable. I have about 2000 photos in my catalogue, but even selecting a photo takes ages. And now for the strange part: the editor is amazingly fast, especially compared to my old windows version! A batch conversion of raw files to jpg is at least 5 times faster. so not a general problem with Sierra or elements. Anyone else with this problem, or a solution?