This is weird. I've just started at a company that uses Drupal (I havent used it before) and I've been tasked with making some simple CSS changes to a site.

I find the site's theme folder and corresponding CSS and make a simple change just to test things out. Nothing happens. I clear the cache via admin and get a 500 error. Fine. So I use drush to clear CSS and JS. It says it works but still no change. I clear my browser cache too just to be sure.

I use Chrome's inspector to trace back the paths of the CSS files I'm working on - they're correct. I even check the themes .info file to see if all the .css files are linked - they are.

So...what am I missing here? What on Earth is going on?

(Edit: CSS aggregators are off)

  • Are you sure you are on the right server? try naming a .css file and see what happens.
    – No Sssweat
    Oct 28, 2016 at 6:45
  • Also, edit your css file and check that the changes made did save.
    – No Sssweat
    Oct 28, 2016 at 7:08

2 Answers 2


I'd turn off CSS aggregation temporarily to see if that makes any difference. The settings are in admin/config/development/performance

That way you can see which CSS files are being used directly. This sounds like it might be a configuration problem with the server itself and not something with Drupal.

Also, check the response headers for the CSS. That will give you more info about whether it's serving cached versions and if there's something like a reverse proxy serving old versions of the files.

  • Sorry, I should have mentioned: aggregators are off.
    – MeltingDog
    Oct 28, 2016 at 1:45
  • In that case, open the CSS file directly with your browser. If you still see the old version then it's not a problem with Drupal.
    – Will
    Oct 28, 2016 at 5:10

Turned out this was because the Theme I was working on refused to be 'activated' despite this appearing so in the UI. I don't know why Drupal was doing this.

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