Discovered last night, fixed one problem, added another.
The "Recent Readings" category no longer seems to register any books I've been reading. I've read a couple of books since doing the update, then deliberately tried several others when I first discovered the problem. It just doesn't work!
And given the size of the main menu page, how about adding a couple of other options there, for one, "Open last read" or something like that, so I can go directly to the book I was last reading, rather than having to dive deeper into the structure of the device memory.
Just a suggestion, but I think it's a good one,