Yesterday when I opened my nook, and the bottom fifth of the Bronte Sisters didn't clear off screen. It went ahead and opened my book, let me flip pages, but you can't see anything in the lowest fifth of the screen. It's had issues with ghost images being left on the screen, but never anything I couldn't ignore. I tried completely recharging it, but that hasn't helped. Is there any way to reset it? I live in Mongolia so I can't take it back to the store.