hi guys,
having played around and searched the forums I have found that the MATE Menu is the only one that works with the windows/super key out of the box so to speak.
If you are going to use Brisk Menu or Main Menu or even the Menu Bar. you will need to go to your keyboard shortcuts and edit the (Show the the panel's main menu).Then you will need to use two keys for example (windows key + spacebar) at the same time to open the menu.
hope that helps you all.
camdy