Just recently when I am trying to read in Ante-Nicene Fathers (V1), the scroll isn't working correctly. I may scroll down a bit in a chapter, only to have it jump back to the beginning of the chapter — or even to the beginning of the previous chapter. I have the book set up on a reading plan, and when I check that I've completed a day's reading it once again jumps back to the start of the reading for that day. When I have the book index pane open, it doesn't seem to always go to the place I click — sometimes to the beginning of the previous chapter (e.g. I click to go to chapter V and it goes to chapter IV), sometimes it jumps to what seems a random chapter (but always earlier in the book than what I clicked to go).