I am a new user who recently installed 7.8.0 operating under Windows. I am using the "VolumeII-Introduction_to_MGED.pdf file. All went well until Lesson 4, "5. Raytracing Your Model". All choices in the Framebuffer menu are grey, nothing can be selected. If Raytrace is selected the raytrace in NOT draw in the Graphic Window, but in a separate window with no menus. I want to use this program for a design project in engineering. Please advise.