[Zubersoft]

Well the first backup after the update would have had to calculate hashes for every file in your library. Those are then stored in the database and don't have to be recalculated again. So it's possible you were just seeing that. I chose to do this as part of the backup as users are already waiting and the entire library has to be initialized and accessed, so it's a convenient time to go through and calculate hashes if they are missing. This only affects songs created before version 3.8.12, and as mentioned, is a one-time thing.

Mike