"Last posts" option seems bugged ?

Hey,
I got the paid version a couple hours ago so I could make a “Last Posts” slider, but every time I try it, the slider either gets stuck on the first slide, or just doesn’t appear.
Image sliders work still fine.

One thing I found is that the “Static Post” options don’t seem to retrieve the posts of one of my two categories, but are able to do so for the other one.
All my posts are assigned to a category, it works with other plugins so the problem has to come from this slider plugin, and I think it’s linked to the plugin not finding the posts in their category.
Any clue ? ??

https://www.ads-software.com/plugins/slider-image/