Matomo interface only shows the menus but no content

I have an instance of Matomo 4.6.2 that now only shows the top menu (blue background ‘Dashboard’ ‘All WebSites’ ‘Tag Manager’. Below this the page is empty. The Admin side menu does appear but all links are inactive.
I have restarted the container and restored a backup of the database but no luck. Also the logs do not show anything strange

Has anyone had the same experience and if so what can I do?

Thanks for any reply