I have a bunch of ePub books which I have uploaded onto the iPad using iTunes. They worked fine previously with cover art etc. however once I updated to ios 5 I am having trouble. In particular, some books now appear on the screen with cover art but I can no longer open them as there is a black line of sorts in each of the books I can't open. As if they were trying to download but can't for some reason. I tried to erase everything and resync several times without avail. Indeed every time I resync what happens is that random books become available but others do not. I can't delete them or move these books anywhere. Any help i can get is greatly appreciated.