I have the same problem; here is a section of my OpenCPN
I think it may have something to do with the RoutrPointIccon? I'm happy to manually edit the OpenCPN.ini file if someone could tell me what is missing (maybe the circle icon?).
BTW, I used VPP2 to create the route
and exported it as a CSV file. I reorganized the data (had to swap lon/lat) and dropped it into:
Edit Garmin POI files, TomTom POI files or Navman POI files - Online POI Manager
which created a GPX file for me.
I dropped this into Google Earth
and it worked; all of my waypoints along the route
had a visible icon. When I imported the GPX file into CPN the only place it was visible was in my ini file.