Menus -> theme locations -> not being saved

Hello,

I am running a WP theme which supports 1 menu. 3 days ago I successfully created a menu, saved it and enabled it. Worked fine.

A couple of hours ago I realized the menu I created was not displaying on the website, but rather the menu from the theme. I was puzzled as I did not make changes to the ‘menus’ menu in WP and did not make any changes to any php files of the theme as well as WP, since I activated the custom menu.

I went back to ‘Menus’. Deleted the menu I created previously and created a new one and saved it. Then when to the ‘theme locations’ to activate the menu. I selected it from the drop down menu and clicked on the save button.

When back to my site (on chrome), refresh the page -> nothing.
Emptied the cache and everything else of the browser -> nothing.
Opened my site on Safari and firefox -> same result.

When back to WP admin panel -> Menus -> only to realize the menu I selected from the drop down menu at Theme Locations -> primary navigation was ‘deselected’. I selected it again and clicked on the save button. Same result. In fact when I go to a different section of the WP admin panel and come back to ‘Menus’, the menu would be deselected from the primary navigation drop down menu. An empty space is displayed, instead of the name of the navigation menu I created and selected from the drop down menu of primary navigation.

I am currently at a total loss…

Please help.

Sincerely,
Anthony