I set it like that:

but there were no transition between slides, nor in Clip Monitor, neither after rendering.

What did I do wrong?

by the way, setting "wipe" and/or "animation" also changes nothing.

Using Kdenlive Version 16.08.1

After some experiments I found, the problems begin with "dissolve" parameters value other, than 1s

moreover, after changing that parameter, the only way to get dissolve on slideshow work is to recreate the clip.

I've tried Version 16.11.70 from Master PPA, the problem still exists.

Are someone from Developers read this forum? Or should I better post it somewhere else?

Hi templar,

You can report a bug or feature request in the KDE bug tracker.

Maybe this guide helps you:
https://kdenlive.org/bug-reports/

I see you already did that.

Thanks for the help.