For the Songbook to work correctly after the update, you must put the User, Favorite and any you have saved to Factory locations, back to the same places.
After the update, I deleted the new styles it put into the Favorites. Then I reloaded the ones I had there previously. Then I put the new styles in a different location, another Favorite Bank. Not many of them I will use anyway.
I also had to redo some changes that I had saved to Factory styles. That is, changing sounds or Keysets, and saving them to the Factory Styles rather than to Songbook. No big deal.