Article ID: 2527363 - View products that this article applies to.
When you run a PowerPoint for Mac 2011 presentation in the Slide Show on a 27" or larger monitor, you may experience one of the following symptoms:
To resolve the issue, download and install the latest Office for Mac updates.
For more information about how to obtain the latest service pack for Office for Mac, click the following article number to view the article in the Microsoft Knowledge Base:
(http://support.microsoft.com/kb/323601)How to obtain the latest version of a Microsoft product for a Macintosh computer
You can also adjust your monitor settings as a workaround: