Just for the record, a remaining issue is :
The 2 blocs that are empty are “Comment faire si” and “Questions/Réponses”.
updating or reinstalling the plugin doesn’t fix the issues by itself as the plugin seems to query the local storage for the data in /wp-content/uploads/comarquage
This folder isn’t updated by an update or reinstall. You need to remove it completlty from disk, then reinstall the plugin.
I hope we also will see less error by “missing xml file”.
Thanks for the feedback guyz.