CADlook Version 21 requires Microsoft .NET Framework 4.0 in order to function correctly. If you are asked to install the framework when you run setup.exe during installing CADlook and if you either reject the installation or are not connected to the internet, you may experience problems to run CADlook. If this happens, re-run setup.exe again and accept the installation of the framework.
ATI or Intel Graphics Chips
Several versions of ATI and Intel Graphics chips contain known bugs in handling 3D OpenGL calls. These bugs may cause various kinds of problems, ranging from not being able to display CADlook 3D window correctly, unable to graphically pick on objects, to crashing your machine. If your machine has one of these chips, you can disable the graphics chips for CADlook by using the CADlook menu Options | Graphics Engine and then choose Non-Hardware Accelerated. Note that after you make the selection, you have to restart CADlook for the selection to take effect.