i dont use iBooks much but i received a gift card and bought a few ebooks. but now sometimes when i try to open them it gives me this message "There is a problem with the configuration of your iPad. Please restore with iTunes and reinstall iBooks." my iBooks app is up to date so im wondering if this problem is being caused by the jailbreak. not all my books are doing this and some even open after i try again. is this happening to anyone else?