I work with powerpoint 2013 and Presenter 2013 on Windows 7. In the past few days, when I do a preview one of the text boxes and its content disappears from one of the slides. I researched the issue, and the same thing happened in 2012 related to the Windows security update KB2753842. I've deleted the update (and made sure it was deleted), but the text box still disappears. Is there anything else I can do?