In the Solar System view, it seems the orbits of Io/Europa/Ganymede/Calisto aren't displayed, even if "Planetary Orbits" and "Moon & Satellite Orbits" are both checked.
In the Windows client, orbits for these moons are displayed when only "Planetary orbits" is checked.
As far as I can tell, it turns out that there was some custom code in the Windows client to draw these orbits, and it simply never made its way into the WebGL engine. #298 should fix this.
In the Solar System view, it seems the orbits of Io/Europa/Ganymede/Calisto aren't displayed, even if "Planetary Orbits" and "Moon & Satellite Orbits" are both checked.
In the Windows client, orbits for these moons are displayed when only "Planetary orbits" is checked.