Color EP Results not working

I ran a correct (at least apparently) EPSimulation, the EP Result seem to work… but the Color Zones by EP Result component doesn’t work well. It shows in the Rhino preview just the wireframe (and even of that, it doesn’t change the color). LegendParameter doesn’t help, i honestly don’t know what the problem might be (but i suspect is something elementary).
EDIT: also the PMV reading tools work but without visualization in Rhino.