Did you mention this problem to the theme author?
Contact your hosting provider and check for mod security rules which are hitting on your website. It might fix by disabling the mod security rules.
Here is how to debug to make sure it is mod_security blocking the ajax POST. You will still need to contact your host to get it fixed on shared hosting, because usually the .htaccess way of adjusting mod_security is disabled.
Skill level: you know how to use the Console in your web browser to see JS messages, how to edit and upload files, and preferably how to read a diff.
1. wp-config.php: add the line define( 'SCRIPT_DEBUG', true );
2. Copy and backup wp-admin/js/theme-plugin-editor.js and edit it as follows. This is from WordPress 5.2.2.
} );
request.fail( function( response ) {
+
+ /////////////////////////////////////////////////////////////////////////////////////////////////
+ // Debug mod-security or other network blockages of POST.
+ // Click + (expand) on "response" variable in browser console panel to see the server message.
+ /////////////////////////////////////////////////////////////////////////////////////////////////
+ console.log( 'xxxxx', '232.response', response );
+ /////////////////////////////////////////////////////////////////////////////////////////////////
+
var notice = $.extend(
{
code: 'save_error',
In other words, add the console.log() line after the request.fail() line.
3. Upload the modded js file.
4. Go to Dashboard / Appearance / Theme Editor, open the JS Console, and try to edit whatever was giving you trouble.
5. Contact support if the response in the JS console says something about mod_security.
6. Return all files to normal.
7. NOTE: don’t waste time debugging in wp-admin/admin-ajax.php. The traffic never reaches it.
