I’ve seen the problem with duplicate entries, but I have not been able to duplicate the problem. I thought it might have something to do with reading both the songs _and_ the .m3u entries, but again, I cannot duplicate the problem. Have you tried deleting the database and restarting mt-daapd? This will recreate the db from scratch. Keep in mind that mt-daapd will not be fully operational until after the db is finished, this could take a while. Do a search for song3.db (or songs.db) to find the db. Mine is in /usr/local/var/cache/mt-daapd/songs3.db but ymmv.