Let me start by saying that I no longer use Nexgen, but... what maps does this screenshot concern? here or tt?
Try inserting a clean poi_visiblities file into the zip, which does not activate any icons.
Activate only the then Total Energies Express from the program. Turn off the program and extract the poi_visiblities that has been formed from the save folder so we can begin to understand the exact text of how the poi is identified.
Bookmarks