Try this (it will fool a lot of folk!)
View the slide at 10% (type 10% in to the zoom box)
Draw a rectangle as big as possible and set it to 99% transparent fill. Make
sure its in the front
Give it a custom animation of disappear - with previous
Set the zoom back to 65% or whatever it normally is.
The rectangle will never appear in show mode but in edit mode will "block"
the slide
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Did that answer the question / help?
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John Wilson
Microsoft Certified Office Specialist
http://www.technologytrish.co.uk/ppttipshome.html