I wonder if anyone has this problem and knows a fix: When I open an attachment in mail (e.g. a PDF), it opens fine and I can view it, but the menus disappear so there is no way to get back to the mail program. Restarting is the only fix I found. I can go back to the home screen, but if I then return to mail, the PDF is still there full screen with no menus.
Bug, or user error?