Hi I have purchased alot of books from instructables for my Nook color. I thought that the problem was with my nook. but have discovered my problem only happens with the instructable books. I can turn pages for about 4 pages and then it looks like the page is turning but it keeps going back to the last page. this happens in all of my instructable books. please help me I find this so frustratiing. I have tried to redownload the books but it still happens. I do not want to delete the books from my account because then it will not show that I have pruchased these books and I wil have to buy them again.