When I started the 3D tutorials, I do not remember this being a problem. Recently, my 3D drawings when choosing Draft or Full rendering actually will render the object, however, the problems comes into play when I actually try to go back to either hidden lines or all lines, "then" this is when the program (windows) ask to terminate and close.
Thanks for any input. Let me add that I have about a 3 year old PC running AMD Athlon II 630 Quad Core, 6G mem, intergrated ATI graphics Radeon 3000. My suspicion is that my PC just does not have the power. However, if it did not have the power, it would just take longer to switch from Full Render back to all lines. (and not crash). Not sure. I have updated my Deluxe v20 to the lastest the other day. It was doing this before the update as well. I am also thinking or remember that my version 19 also seems to do this as well, which points me back to the PC. If it is, then I am not sure where to start to troubleshoot this one.