Using administration pages on an old Drupal 7 installation, the "normal" admin CSS styles are sometimes gone and the page appears with the frontend layout.

After reloading the page, the normal admin CSS is back.

What could cause this problems, and how could I fix them?


Frontend layout mixed into admin page: Frontend layout mixed into admin page

Correct admin layout: Correct admin layout

  • Any errors in the browser's console when styles don't load?
    – No Sssweat
    Nov 12, 2020 at 11:09
  • No. Comparing the included CSS files shows that instead of adminimal_theme CSS files, the frontend theme files get included.
    – cweiske
    Nov 12, 2020 at 12:19
  • How do you load your frontend css files and where are they placed in the folder structure? Nov 12, 2020 at 13:10
  • CSS files are loaded via the theme's .info file, e.g. stylesheets[all][] = stylesheets/logged-in.css and are in the theme folder: sites/all/themes/mytheme/stylesheets/logged-in.css
    – cweiske
    Nov 12, 2020 at 14:05


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