Dang Boom Bang

OK, after lots of juggling around with all kind of advice I found the reason why its not working:

tata … in my Apache Configuration File the working directory was marked with “AllowOverride None”. With this the .htaccess and its WordPress part are not in effect what causes the problem. After changing it to “AllowOverride All” it worked like charm again.

Hello all, unfortunately i have the same problem on a different installation. I can not imagine, that I am the only one having this issue.
Any help available ?

Hello, thank you for your reply.

I tried this with the Chrome browser, but with the same result.

I opened a browser console (to be honest, I am not familiar with that) and it showed me the following

Layout-Darstellung wurde erzwungen, bevor die Seite vollst?ndig geladen war. Falls Stylesheet noch nicht geladen sind, kann dies zu einem kurzzeitigen Darstellung des Inhalts ohne Formatierung führen. 5ea0c184-2d61-469d-a31b-4f49b19c6ab4
Das Cookie "" wurde als Drittanbieter abgelehnt. load-scripts.php
Anfrage für Zugriff auf Cookies oder Speicher für "https://zimservice2.de/7986hu/wp-admin/load-scripts.php?c=0&load%5Bchunk_0%5D=wp-polyfill-inert,regenerator-runtime,wp-polyfill&ver=6.4.3" wurde blockiert, weil alle Anfragen für Speicherzugriff für nicht direkt aufgerufene Websites (Drittanbieter) blockiert werden und das Blockieren von Seitenelementen aktiviert ist.

This translates to (Translated with DeepL.com)

Layout display was forced before the page was fully loaded. If stylesheets are not yet loaded, this can lead to a temporary display of the content without formatting. 5ea0c184-2d61-469d-a31b-4f49b19c6ab4The cookie "" was rejected as a third-party provider. load-scripts.phpRequest for access to cookies or memory for "https://zimservice2.de/7986hu/wp-admin/load-scripts.php?c=0&load%5Bchunk_0%5D=wp-polyfill-inert,regenerator-runtime,wp-polyfill&ver=6.4.3" was blocked because all requests for memory access for websites not directly accessed (third-party providers) are blocked and the blocking of page elements is activated.

Unfortunately that does not say much to me. I hope that helps somehow.