WordPress backend design error (layout shot)

Today we are fixing a problem that was reported after Updates from WordPress or themes can occur. The unusable WordPress installation.

Maybe someone's seen it before. After logging in under e.g. /wp-admin the familiar WordPress Dashboard not anymore. Only all texts are displayed one below the other on the left.

This looks for instance like this:

There are several problems that cause this. Mostly plugins are responsible for this.

Possible solutions:

1. Disable all plugins
2. Clear Browser Cache
3. When the dashboard is displayed again you can activate the plugins individually.

Alternative solution:

Edit the file wp-config.php and add the following line above:

define('CONCATENATE_SCRIPTS', false);

With this setting WordPress will then load each script in the administration page individually. If one of the scripts cannot be loaded or does not work, the others will be loaded and executed anyway. This is a solution to the display problem, but it does not solve the cause.