Hi. I am new to traktor 3. I only use 60 - 80s music with it. I imported some of my series and analysed the songs. After this, I made several playlists. Suddenly the playlists are completely empty, some still have a part of the songs in it (may 10 from 50). Even if I open a backup Track Collection, the playlists are corrupt. All Metadata are still there. The only thing I did was to make a new setup with the wizzard after the tractor surface was bad. The small angle right from "active" was gone (used extended mode). After the new setup it showed as usual.
