This is a bug in my WP install that has crept up unknowingly; I can't say for sure when it began.
To describe it: there were menus created in the Appearance -> Menus page early in the site's history, and they work perfectly, as in:
- They have menu items
- They can be assigned to menu locations
- They can be renamed
As of recently, as new menus need to be created, I've noticed the following problems when creating a new menu:
New menus can be created, but after clicking "Create Menu", the sidebar with Posts and Pages to use as menu items, is still grayed out The menu cannot be renamed:
- The menu name does not show up in the "Menu Name" text field, and subsequent clicks to "Create Menu" simply duplicates these new-yet-unusable menus each again per new click (ex: I create Test1, then create Test2.. now there are 2 Test1 entries, and 2 Test2 entries... creating Test3 repeats the effect, creating 3 of each)
- Clicking "Manage in Customizer" next to the "Menus" heading results in the following error:
Fatal error: Uncaught exception 'Exception' with message 'Illegal widget setting ID: nav_menu_item' in /Applications/MAMP/htdocs/discoverlongisland/wp-includes/customize/class-wp-customize-nav-menu-item-setting.php:179 Stack trace: #0 /Applications/MAMP/htdocs/discoverlongisland/wp-includes/class-wp-customize-nav-menus.php(551): WP_Customize_Nav_Menu_Item_Setting->__construct(Object(WP_Customize_Manager), 'nav_menu_item', Array) #1 [internal function]: WP_Customize_Nav_Menus->customize_register(Object(WP_Customize_Manager)) #2 /Applications/MAMP/htdocs/discoverlongisland/wp-includes/plugin.php(525): call_user_func_array(Array, Array) #3 /Applications/MAMP/htdocs/discoverlongisland/wp-includes/class-wp-customize-manager.php(583): do_action('customize_regis...', Object(WP_Customize_Manager)) #4 [internal function]: WP_Customize_Manager->wp_loaded('') #5 /Applications/MAMP/htdocs/discoverlongisland/wp-includes/plugin.php(525): call_user_func_array(Array, Array) #6 /Applications/MAMP/htdocs/discoverlongisland/wp-settings. in /Applications/MAMP/htdocs/discoverlongisland/wp-includes/customize/class-wp-customize-nav-menu-item-setting.php on line 179
I've disabled all plugins and the problem persists.
Has anyone run into this before?