Thanks Bartosz.
Sounds perfectly consistent for me.
In fact, I just check this, and now it works well indeed.
Great effect when the slideshow is running!
On the other hand, not only I had to desactivate the Carousel, but also the Mosaic Gallery option.
Too bad this isn’t compatible with your plugin, as the design of the original gallery in WordPress posts looks quite cheap.
Anyway, you did a great job on your side.
And again, thanks for your help.
Now I’m gonna dig in the CSS to see if I can improve the look of my galleries.
;)