The Slide Transition dropdown list, located in the TIMING panel : Yes or No

[Raph59]

That subject link says it all. Do you USE THEM or NOT?

I tried a few and each time it caused weird and strange things to happen, nothing that had anything to do with a slide's transition.

Could this be a leftover of SWF? And that's why they aren't working as advertised when you Preview in HTML5 Browser?

Thanks!

[Lilybiri]

Did you check the HTML tracker under Project menu? You'll see that slide transitions are not supported for HTML output. Some may be functional on desktop/laptop, but no guarantee at all.