Changes to \themes\theme_20\theme_3_1.css have no effect on my app

Hi,
I am trying to change the background color of my application by changing the my stylesheet. It has no effect whatsoever.
If I rename the css-directory from "theme_20" to "theme_less", my app looks completely confused, so I know that I must be looking at the right file(s).
I use Firefox and the APEX version is 3.1.0.00.32.
What am I missing? Ideas, anyone?
Thanks!
Remco

It's recommended not to modify the built-in themes. Your changes could get overwritten and lost by a future APEX upgrade, or lead to unwanted customisation of other apps. Make a copy of the theme and customise that. If accessing CSS from the server filesystem, it's preferable to put your theme files in another location from that referenced by /i/. Another virtual directory can be set up in the DAD.
Use the Firefox Web Developer or Firebug extensions to determine what style sheets are being used. Firefox can cache CSS quite aggressively, so check you're not getting stale versions by loading style sheets on their own using Web Developer or entering their URL in the address bar. If the old version is shown then try refreshing.

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Changes to \themes\theme_20\theme_3_1.css have no effect on my app

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