[ddouglass]

If you already deleted the duplicate files then just Rebuild the database and that should eliminate them. In the future always delete songs from the Edit Songs. This will detele the KMH header or KMA file and remove the information from the database.
As far as taking Hoster taking a minute to open this would not be unusual considering how much has been added to the program.
With the Singer's database if this is happening then I would suggest doing what I told Jimski51 above to open it and leave it open that way you don't get song interuption as it is opening. Don't minimize it but slide it down to where you can see the top of it to be able to grab it and drag it up to use.