Ade 4.02 Problem with PageUp/PageDown

Using ADE 4.02 on Windows 7. When viewing an ePub book the PageUp/PageDown functions advance the page number at the bottom of the display, but do not update the text. If I switch to Library view and then go back to the book, the page text updates to correspond with the page that I advanced to. This makes it impossible to read a book on the PC.  Everything works fine on my Kobo reader when the book is downloaded to it, but I'd also like to be able to read on the PC.