WordPress visual editor broke due to non standard port?

I had exactly same issue with Visual Editor but my site was working on port 80.
This is what I did :
Edited wp-config.php and added the following : 

define( 'CONCATENATE_SCRIPTS', false );

and everything worked fine.
Additionally you can check if wp-includes/js/tinymce/wp-tinymce.js.gz file exists or not. If not, then upload it via FTP

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