BTW, using WIndows 8.1 EnterPrise, 64bit, with Office/PowerPoint 2013. When I open a second PowerPoint file after having one already open, PowerPoint opens a second instance of the application, not just a new file for the first instance of the application. When I go to save a PowerPoint file, I get a message saying “Sorry, PowerPoint has an error and you must save your work and restart PowerPoint. And when I try to save the file, I get the same message again making it hard/impossible to save the file before closing it. Because of that, any changes made since the last time I was able to save it are lost.