Welcome to Autodesk Forums!

Hi,

I think you need to try to reset AutoCAD :
Resetting AutoCAD for Mac:
if you want to reset AutoCAD options to default settings, you need to launch AutoCAD from Dock by holding Shift key on keyboard and clicking on AutoCAD icon (you need to hold Shift for at least a few moments after you click on icon). This helps in the case when you cannot start AutoCAD normally.

Maxim