Running Sierra 10.12. Hoping someone can answer/help me with this problem. LR is not recognizing an already sync folder. So when I sync an old folder, it will show that it have all the photos (for example 40 out of 40 photos in that folder) needing to be synced. If i sync this folder, the 40 photos are recognized to be already there, so I can only sync if i click the "new" tab. Alternatively, I can sync a group of new pictures (lets say 12 pics). But if I immediately click sync again, it will tell me that i have 12 pics that need to be synced. If I press sync, the screen is greyed out since it knows they are there already. But if I uncheck "avoid duplicates', and click "new", the pics show up and I can "copy". When I check on "finder" , I have now duplicated the pictures. Additionally, if I use "update folder location" it know correctly where the photos are located. There are no ? or ! symbols on the photos.