Hi Nobia,
I found & fixed the problem. The app Jetpack that I installed has an option for mobile devices that has to be clicked ‘on’. Thanks for your help and please pass along this tip: check all apps & widgets for mobile device options. It was also suggested that some WP themes do not work on mobile devices, but I cannot verify this. R.
Thanks Nobita, I changed the menu background color as you suggested and the problem (when viewing the site with my Android Samsung Galaxy S5) still exists – no menu items appear. The background color changed out just fine, but the menu items themselves are hidden.
