I have a new installation of Drupal 7. I was having a problem with administrative overlay URLs having URL encodings in them, which I asked about here. Another user suggested I confirm that I have clean URLs enabled.
When I went to Home » Administration » Configuration » Search and metadata » Cleanr URLs, all I see is this:
Use URLs like example.com/user instead of example.com/?q=user. If you are directed to a Page not found (404) error after testing for clean URLs, see the online handbook.
The message was followed by the button, "Run the Clean URL test." that seems to do nothing: The browser tells me it's loading something from the site, but the page doesn't change.
I have no options to enable or disable clean URLs.
I'm pretty sure it's disabled, because when I go to website.com/user, I get a 404.
How can I troubleshoot this?