Editor doesn’t load properly on my self-hosted WordPress 3.3

by

from wordpress.org/forums:

WordPress 2.8 includes a concatenation of scripts and CSS. This puts
the quality of these scripts at a higher level than before.

The temporary solution is to place it in the wp-config.php one of
these two values

define(‘CONCATENATE_SCRIPTS’, false );

or

define(‘SCRIPT_DEBUG’, true);

Now this is from over a year ago, worth a shot.