Great
I am delighted that you can have more than one genre level. Is it supposed to work with three levels? When I tried it, there was just the word for the subgenre with the number zero in parenthesis in genre view and the book with this genre won't show up.
When I sort by title in genre view the subgenres are sorted as titles. Example: I have the genre Fantasy at the top, then titles A-T, then the subgenre Urban Fantasy, then titles V-Z in Fantasy. It would be nice to have all the titles for Fantasy together and then the titles for the subgenre.