I have been working my way through an external hard drive with about 30000 music and music video tracks on it. All the duplicates show up and I have deleted duplicate music or video files as necessary, and in some cases kept duplicate files that De-Dup has shown as duplicates, but that I want to keep both versions of, which I have done by clicking the X in the top right hand corner. Problem is that when I later come back to the disc to continue the process, a fair number of the files I have hidden as being acceptable duplicates show up again in the list, it's not all of them that I have hidden, but does seem to be the same ones that keep reappearing no matter how many times I hide them by clicking on the X. Have latest version on the laptop, although did originally have the earlier version of perfect tunes, but did re-index the drive when I upgraded. Any ideas how I can overcome this issue