If you open the Library in Cover View and double-click on a book cover, the book does open, but the focus returns to the Library. Expect the focus to go to the book you've just opened. It works fine to open books from other views in the library (by clicking once on their title or cover icon, which is all that's required in those views), but since Cover View requires a double-click, it seems that the second click is returning the focus to the library instead of leaving it on the newly opened book as expected.
Screencast to demonstrate the problem: http://www.screencast.com/t/IQ8hCN1vu
