I have a number of pbbs that I am experimenting with. Since we can't delete them yet my list has grown. Yesterday I opened up the pbb tool and clicked "Add book." It looked like nothing happened, so I clicked a couple more times. It turns out my list was too long and I could not see the end of the list where the new projects were being added!
So now I have a list of blank books.

I suggest that after Add book is clicked the focus shifts to the newly created book, or the blank book gets added to the top of the list so that this doesn't happen (granted, when we can delete them this won't be as big a deal).