A family of Microsoft presentation graphics products that offer tools for creating presentations and adding graphic effects like multimedia objects and special effects with text.
Jim
IF you are happy playing with the Registry you can try this:
Make sure PowerPoint is fully updated.
Start with PowerPoint closed.
In Regedit navigate to HKEY_CURRENT_USER\Software\Microsoft\Office\14.0\PowerPoint
Add a DWORD and name it IgnoreDevModeColor
Set the value to 1
This is meant to fix another bug which prints pure B&W in Grayscale but may also fix your problem