I wanted to try out the Lego 3D designer called SR3D (find it on the Internet), but it does not seem to work. It launches fine, I get the GUI, but in the model area I can only see the coordinate system and boundingbox of items. No 3D graphics. It uses DirectX and some custom primitives for drawing. It is supposedly working great under VMWare, but I did not upgrade to 4.0. So I guess the problem is with Parallels.