@sgodar, I got my site working with your tip. Thanks ??
Article Directory Plugin
Show Text Editor: NO <— This is important, otherwise, you’ll get 2 editors showing up
Open /plugins/aricle-directory/author-panel.php in a text editor and replace line 269:
wp_tiny_mce( false, array( 'height' => '370' ) );
with
wp_editor( $content, array("tinymce" => $a));
You can check it at https://articlestockdirectory.com using test as username and test as password. I’d like to get some feedbacks if you encounter some errors ??