Apparently, it's not just Android phones. I had a scrolling problem today with my notebook computer (running Windows 7 & using Firefox browser). I read several challenge stories with no problem, then when I opened another, it would not scroll when I got to the bottom of the screen. Instead of scrolling the text in the box, the whole larger window started to scroll. Usually when this happens, I can click in the story text box and then it will scroll again. But today, when I clicked in the box, it highlighted all the text (which I didn't think you could do). Then the story closed and a box briefly appeared on the screen, saying something about not copying stories and that my account would be closed for downloading copyrighted stories. Before I could finish reading it, it disappeared and I was logged out.
Obviously, I was able to log on again, but I was afraid to read any more challenge stories. I think I will try one more time, but if that happens again, I will skip the rest of them.