So I was reading a copy of Robinson Crusoe in-game and tried switching to my axe. My character switched to it, but the book covering most of the screen didn't close as I would expect it to if I were switching from one item to the next.
The same thing happened with other items I'd had on my hotbar. I was also unable to use these items (drinking soda, eating food, etc.).
Another problem I had is that you can only open books when you hotbar them (i.e. dragging into hands doesn't work) and it causes a graphical glitch with the: previous/next page buttons when you open inventory.