Hi Steve,

In general all Joomla Admin problems > forum.joomla.org - that topic was there a few times. Your Joomla cannot load needed .css nor .js files from Atum Admin template, media/vendor and media/system/ folders.

As I remember problem was be caused by old .htaccess file or/and Gzip compression.

Emergency Tips:

• Rename .htaccess to htaccess.bk
• Edit configuration.php file, and change value from true to false, save changes. Find line with: public $gzip = false;

and it may help by now.

Paul, thank you so much. I changed the .htaccess file name and that appears to have resolved the issue. With kindest regards, Steve.

Now You have to check which rule from .htaccess made that mess, becuase having that file is important for security & SEO etc. Maybe your file was from older J4 version, not current one.