when I want to update, an old email appears and cannot be erased
My problem has been 'fixed' twice at a genius bar, once on my old mac pro, and now on my mac air:
when I get a notice to update, an old email appears in one box and a blank space for my password in the adjoining box. The email is light gray and cannot be erased.
Therefore, I cannot use my ibook author nor can I update
MacBook Air, OS X Mavericks (10.9.5)