"Saving didn’t work!" error when saving Enfold theme settings

The “Saving didn’t work!…” pops up IMMEDIATELY when I click “Save All Changes”. No loading or anything. It’s instant.

I have checked through the forums and have tried every possible method to fix this.

I’ve had the same hosting account for quite a while and never had any problems until after upgrading WordPress and Enfold, so I chose to do a fresh install of both WordPress and Enfold just in case –disabled all plugins and still have the same problem.

Everything else within WordPress works. Just saving the Enfold child theme settings fails every time.

Wordpress Version 5.2.1
Enfold Version 4.5.7
PHP Version 7.1.14
Web Host: Hostgator
Hosting plan: Shared / Baby with cPanel

Set Permissions to 777 on the following folder and all files within it:
wp-content/uploads/dynamic_avia

Contents of web root .htaccess file (also deleted the .htaccess file and re-saved permalinks to recreate it) :

# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ – [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>
# END WordPress

There are no other .htaccess files (not in /wp-admin folder).
No robots.txt file in web root

Added the following to wp-config.php
define (‘WP_MEMORY_LIMIT’, ‘256M’);

No errors showing in error logs.

Please help!