Like many other people I'm also experiencing problems with WordPress 3.5. The Add Media and Text tabs are not working. I've deactivated my plugins as well as unsuccessfully trying to downgrade my wordpress to 3.4.2. Both attempts proved uneventful.
I've read about adding define('CONCATENATE_SCRIPTS', false ); in the wp-config.php file might help, but being a complete newbie when it comes to the more technical aspects of wordpress, I don't understand how this is done.
Is it possible that someone can provide a step-by-step way on how to accomplish this.
Any help is greatly appreciated. Thanks.