Are you sure the transition is set to auto after xx secs?
Is there music / sound on the slides
Is there a video?
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john ATSIGN PPTAlchemy.co.uk
Custom vba coding and PPT Makeovers
Free PPT Hints, Tips and Tutorials http://www.pptalchemy.co.uk/powerpoint_hints_and_tips_tutorials.html
PPTLive Atlanta 2009