Ipad ADE will not open book

I installed ADE on an Ipad.  It was working fine for awhile.  Then suddenly, whenever i try to open a book, it simply returns me to the home screen.  I have uninstalled and re-installed several times.  This did not help.  Whenever I re-install and refresh it picks up every book I've ever loaded there even though I deleted all but one of them.  Can anyone tell me how to get ADE to open my books?