Live Preview Not working

Hi All,

Sorry if this has been answered before but nothing seemed to work for me.

It was working fine for a while but now all I get is a blank screen when I enter customise.

I was using a child theme but hadn’t made any changes yet.

So far I have deactivated all the plugins reinstalled wordpress and tried the

<?php
/*
Plugin Name: My Custom Plugin (any name you like..., must be unique)
Author: Your Name
Version: 1.0
Description: Customizer Bug Solution (You can write what you want here)
*/
remove_action( 'shutdown', 'wp_ob_end_flush_all', 1 );
?>

I deleted the cild theme and the full theme reinstalled but nothing works 🙁

Has anyone got any more suggestions before I do a complete un install?