To restore the"IT Studio Menus and Toolbars perform the following:
1. On the AutoCAD Command: line type MENULOAD and press enter.
This will restore the 21CI menu at the top.
2. On the AutoCAD Command: line type OPTIONS and press enter and make the following changes to the "Files" and "System" tabs.
Exit "IT Studio" and re-start "IT Studio". The menu and toolbars should now be available.