The entire UI was horrific for me. I had to use full screen since the slide didn't show up fully otherwise, and even in fullscreen Page up/down keys didn't work, arrow up/down keys moved terribly slow (like 1 page/minute slow), and the only way for me to navigate was to use the mouse scroll wheel (or the scrollbar on the right). I'd really like to know if I missed something or it was this way for everyone.