This is what I see when I want to add text and try to open an textwindow. in all kategories, sites or projects. Everything else is working but text, I already checked all your questions to update and I also added "define('CONCATENATE_SCRIPTS', false );" to my wp-config.php. and made sure "Disable the visual editor when writing" is not checked.
So I need HELP.
Before I have top completely delete WP installation!!!