I am using a planet shader on a fractal terrain. I can't get a proper render although the preview looks fine. I haven't changed any of the settings in the shader. I had the atmosphere quality at 64 then changed it back to 16, still get really strange renders. Sometimes the Preview window also shows the weird coloring but goes back to normal with "reset". Sometimes the preview window turns a solid bright blue. I've tried quitting and restarting Terragen several times, and I've tried both Full Render and Quick Render. I'm on an iMac, 10.4.9, intel core 2 duo, 1GB memory, 2GB processor. Latest TG2 (build 1.8.76.0)