I have setup the sidebar navigation menu to be a widget, as I couldn’t get the standard menu to appear as anything other than white (nothing). Now it works as viewed in Desktop mode, but as soon as I choose Tablet or Smartphone view modes, it comes up with the standard ronneby menu, but unpopulated. Desktop Tablet/Smartphone
Seems you have added changes to the side area and not the primary menu. To have the menu you need to go to Appearance > Menus > Manage locations > Primary navigation > choose the menu from the dropdown. So you will have the menu on desktops and mobiles/tablets.