My guess is that the animations on the pictures have been set to happen on a
click instead of one of the timed methods. You can check that by doing Slide
Show---> Custom Animation.
(If you need more details on changing the timing of your animations, let us
know your PPT version.)

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Kathryn Jacobs, Microsoft MVP OneNote and PowerPoint
Author of Kathy Jacobs on PowerPoint - Available now from Holy Macro! Books
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I believe life is meant to be lived. But:
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>I have a presentation with 9 slides, each slide consists of 1 full-screen
> picture. There are no animations or effects. When I play the slide show,
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> seeing the background when I view the slide show?
> Thank you in advance!