Users on Mac OS X (10.8.5) when attempting to screen share a keynote presentation may experience problems and the participants may not be able to view the presentation.
As a workaround, when opening Keynote - change it to full screen mode before choosing "Play". Here are the steps:
When the presentation is open,
- Choose View -> Enter Full screen.
- Then choose play.
Keynote on a Mac OS X(10.9.1 - Mavericks) should not experience this problem. But if it happens to be an older version of Keynote they might and this workaround should work for them as well.