While working on one of my client WordPress site, I come across a issue which after some updates, the Visual Editor is no long working.
I search for the solution on in the forum and here is the fix for my issue.
define( ‘CONCATENATE_SCRIPTS’, false );
This seems to be an issue with the tinymce js files and it keep throwing some error whenever I click on the Visual tab.
For more information you can read through the thread here .