I'm not sure how to phrase this, but iBooks is constantly ‘working’ on something; I never get an "Edit" button in the top left corner to sort, delete, or move books to different collections, but instead I always have a spinning progress indicator. See screenshot:
What might cause this and why won't it ever go away? I have a large collection of eBooks, so iBooks has always been a bit slow, but I know I used to be able to hit "Edit" and move them into smaller collections. Now I can't even do that.
The new update fixed this issue and others I had with iBooks. I'm not sure if leaving it open to reindex would have worked or not, since the updated version re-indexed my 3,025-or-so books in just a few minutes. My searches in PDFs and books with thousands of pages are much faster as well.
Altogether, a good update!