Hi Norman,
Apologies for a belated response to your post. Are you continuing to experience these issues ?
Playlists are contained in the Roon database along with edits within Roon (as distinct from tags embedded in the file). Backing up the database in the Mac OSX library folder is prudent and there is a discussion about it here:
If you are continuing to experience these issues then we will ask @kevin or @vova to look into it further.
Cheers,
Andybob