In your render box on the first tab, all the way at the bottom, set it to ActiveShade. When you do this, you will now have a Raytracer tab at the top. Click it and deselect ‘Enable Raytracing’, ‘Show Progress Dialog’ and ‘Show Messages’. That will disable Max’s built-in raytrace engine and all its associated messages. Then just switch back to ‘Production’ at the bottom.