I am having serious probslms with iBooks. The books show with a black line through them as though they are waiting to download. They will not open. So far I have updaged my iPad2 to the latest version of iOS. Deleted the ibooks app and reinstalled. I have gone back to iBooks and opened my collection and I have tried downloading again a book I already have. That works for a while but then the books become inaccessable again. One book Winnie the Pooh (which I have not bought but was with the app orginally) I can neither delete nor downlaod. So any ideas of what to try next?