Standard slideshow with 0sec. transmission won't start

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Hi

I've got C5 in version 5.6.0.2 installed. And I use the standard slideshow within C5. But when I reduce the transmission time to 0sec. the slideshow won't start. I takes like 21sec. till the first image appear. And that's it. No changing to another image.
What can I do to change that?

Thanks

wasabili