[lepoilu]

Nope, I tried that too!! I also tried doing a Node, but everything that points to a multi-path movie source fails.  

 Indeed there seems to be a problem with Multits sources ...

You have to ask the question in the right place, because it has nothing to do with the skin, since the problem exists with the creation of playlists.   

 I found a way around!
I deleted my multi-path video source (3 movie folders), then I created a video source for each, then I created a node that bonded the 3 sources, and it worked!!!. I will keep it this way because I noticed, that many things in kodi don't like multipath video sources.  

 I do not use the multi-path, I just tried to reproduce the problem.

I only use the playlist to group, divide ...
Then I add my playlists to the widget.