[HarryT]

One thing I've noticed with the new version is that when, from a book, I tap the menu item to return to the library, there's a significant delay (about 10-15s) before the library screen appears, whereas previously it was instant. I do have quite a large library on my Kindle (around 1500 books) which may account for it.

EDIT: Similarly, if I switch away from the Kindle App with the library screen on display, and then switch back to it, everything is frozen for about 10s before the library page starts responding. A real nuisance. I've reported the issue to Amazon - I hope they can fix it!