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BTW, using WIndows 8.1 EnterPrise, 64bit, with Office/PowerPoint 2013. &nbsp;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. &nbsp;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. &nbsp;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. &nbsp;Because of that, any changes made since the last time I was able to save it are lost.
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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.

Unable to save PowerPoint File

PowerPoint is a slide show presentation program currently developed by Microsoft. PowerPoint presentations consist of a number of individual pages or "slides" that may contain text, graphics, sound, movies, and other objects, which may be arranged freely. The presentation can be printed, displayed live on a computer, or navigated through at the command of the presenter. Slides can also form the basis of webcasts.

Microsoft PowerPoint

Microsoft Office is an integrated suite of applications that includes Outlook, Word, Excel, Access, PowerPoint, Visio and InfoPath, along with a number of tools to assist in making the individual components work together. Coding within and between the projects is done in Visual Basic for Applications, known as VBA.

Microsoft Office

Microsoft applications include a variety of software programs, including development and digital authoring programs (Expression and Media Center), educational programs, Internet software, including Essentials, Skype and the Live family, anti-virus, productivity applications and suites like Office, Excel, Word, Outlook, Access and PowerPoint, video games and server applications such as Exchange, SharePoint, IIS and Virtual Server.