All was going well with testing. I've run 3D again today and with the Network settings on Medium, all my little aeroplane symbols in the coloured spheres have vanished!
Also, in the 3D country and county boundaries seem to have appeared where they did not exist before and I can't see any way of turning them off. Using the RB Country boundary etc options do not seem to affect the 3D view, only the 2D view.
I've tried changing all the 3D Preferences, but I can't get the aeroplane symbols back.