Here are instructions to upgrade to the latest version of Flash Player, which resolves Xcelsius not rendering in PPT. Please use or forward these specific instructions to minimize any further troubleshooting:
1. Open Internet Explorer.
Upgrading Flash Player in Firefox or Chrome will NOT resolve your issue. Using IE, will upgrade the ActiveX version of Flash Player used by PowerPoint.
2. Check to ensure you have Flash Player 10,1,82,76 or later by clicking on the following link:
http://www.adobe.com/software/flash/about/
3. If you have an earlier version, with IE, download the latest Flash Player :
http://get.adobe.com/flashplayer/