How to resolve WordPress Undraggable Widgets
If you’re a new WordPress users, or perhaps even a veteran, you may have noticed an inability to work with your widgets at Appearance -> Widgets in your Dashboard. This is fortunately not common, but it can lead to a ton of confusion and many hours of frustrating attempts to fix it.
define('CONCATENATE_SCRIPTS', false); below the
define('DB_HOST' line and save the file.
In most cases, one of the two methods will work for you. If you’re still having trouble, stop by the WordPress Support Forums for further assistance.