I think I've found a small bug in the pdfreader (I don't know if it has already been reported):
When I go to a bookmark using the "show bookmarks" option, the first time I clic with my finger in the right of the screen to go to the following page, it goes to the previous page instead. The next time I clic on the right of the screen it works ok. This bug doesn't apply when I use the buttons to change the page. Can you replicate this behaviour?