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One workaround:

Put a screen-filling neutral (e.g., white) borderless rectangle in the back of in a shared layer. Give that shape a null action. Apparently "Do Nothing" doesn't count as one, but a null script does:
   tell self
   end tell
You'll want to turn off highlighting in the presentation if you do this.

Last edited by john.gersh; 2011-11-29 at 05:16 AM..