I just added a new folder called “old pictures” to my existing tonfotos library knowing that many of the pictures would be duplicates of pictures in my two main folders. I’d like to delete all of the duplicates. The Delete All button appears for 3 of the 4 categories listed but it is greyed out. It does not appear at all for the 4th category. I don’t see how to accomplish the deduplication I was hoping for. Any help you can give would be appreciated. I’ll try to attach a screen shot. 
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Delete All button missing or greyed out on Delete Duplicates window
jayelfisher The “Delete All” button can be grayed out if there is no access to the files right now (drive is disconnected or read-only).
Third line has to button for automatic deletion since app cannot decide which of copies needs to be deleted and which needs to stay, you need to make this decision. Imagine there is photo a.jpg that is in two folders inside “old pictures” directory, “Me and my wife”, “our wedding photo shoot”. How can app decide where to delete and where to keep? It can’t, that is why there is no button.