I have a collection of 2,900 images. I have been sorting them but I have found 54 (all adjacent to each other that were sorted into their position) that will no longer sort (trying to fine tune the sort). I can select some of them, drag them to where I want them to be, the black bar appears, but none of the images change position. I can't figure out what is going on.
On further sorting I find that if I move other images close to the problematic ones, they will not sort properly. I can select and drag them to the appropriate spot, but they are dropped in the sorting action in locations other than what I picked.