Just upgraded another machine to Windows 10. My "Task bar and start menu settings" dialog is missing the "Start Menu" tab
(right click an empty area of the task bar, select "properties", brings up a dialog that usually includes tabs for Taskbar, Navigation, Start Menu and Toolbars. All there, all nifty except the "Start Menu" tab missing.
I've used this before on another computer, see also this pic:
Any idea what could cause this? I want to re-enable the full screen start menu (yeah, laugh at me all you like)