Visual Editor does not appear

First try going to the Twentyten theme to see if that resolves it. Sometimes things work differently even though they seem idenbtical.

In the last line of ‘wp-config.php’ paste:

define('CONCATENATE_SCRIPTS', false );

It worked!!!
After countless hours of searching and implementing all kind of solutions from the net, this is the one that made my visual editor appear instantly!

Thanks a lot!!

Hm, didn’t do the trick for me. Did you have to restart something to make it work?
(I mean, how often is this config file being read …)

I didn’t do anything special. I just added that line at the end of my wp-config.php file (which is the default wp-config-sample.php file, copied and modified to fit my blog’s settings), the resulting final part of the file being:

/** Absolute path to the WordPress directory. */
if ( !defined('ABSPATH') )
	define('ABSPATH', dirname(__FILE__) . '/');

/** Sets up WordPress vars and included files. */
require_once(ABSPATH . 'wp-settings.php');
define('CONCATENATE_SCRIPTS', false );

Then, at the next refresh of the post-edit page (blog.example.com/wp-admin/post.php?post=73&action=edit – there’s no need for any other restart), the visual editor worked as it normally should have.

Are you in 3.3?

In the last line of ‘wp-config.php’ paste:
define(‘CONCATENATE_SCRIPTS’, false );

Thank you very much mozartweb!!!
Now the WordPress 3.3 visual editor finally works!