** UPDATE **
The bug has been fixed in the following update: http://support.microsoft.com/kb/2837634
You might have to break the farm, and recreate it after the update.
**/UPDATE**
There is a known bug affecting windows 8.1 users when they try to present a PowerPoint presentation in any meeting. If you have installed any version of Windows 8.1 and tried it, you might have seen the all too ![]()
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