Since the playbook can't handle epubs yet, I am reading through some PDF books. On my computer the PDFs are fine. When i copy it to the Playbook (into the downloads folder) and open and read, most pages are fine, some pages are blank. They may have the bottom footer which just has the chapter title or something, but the content of the page is blank. Usually happens for the last 8-10pages of a chapter. Again, these pages are fine on my PC.