I was using 2019x64 fine yesterday then it would crash on launch uninstalled and reinstalled (2 times), no change. I upgraded to 2020x64, it opens, license was activated fine menus are all fine I can change options. When I open drawings I created, the model space is blank. The mouse pointer is normal on all the menu icons, when it moves to model space it changes to a broken horizontal lines. When I attempt to draw in model space the menu Icons are greyed out and unable to draw anything. What is wrong? Thanks!