After installing the latest version for 2020, all functions stopped working. 1st could not change the model color from white to anything else. 2nd could not make any changes to the imported file, even though it was hiding behind the white model screen. 3rd could not type any command in the command window. Went back to 2019 version that was working perfectly and now has issues also. Can not make any changes to any file i import in. Does anyone have any feed back on what I can do?