Disallowed Key Characters that don't seem to be able to fix in config

[eluser]shwonkbc[/eluser]
Hey CI,

I'm using Phorum, a messageboard, in conjunction with CI. Phorum, for some reason likes to use commas in their URIs when loading their CSS. Example:

http://MY-WEBSITE.com/messageboard/css.php?0,css

Unfortunately, this is greeted by CI with an emphatic "Disallowed Key Characters". I did some research and found you could fix that in config.php. I went in and changed:

$config['permitted_uri_chars'] = 'a-z 0-9~%.:_\-=';
to
$config['permitted_uri_chars'] = 'a-z 0-9~%.:_\-=,'; (added a comma).

CI is still giving me the Disallowed Key Characters message. What can I do to fix this?

Thanks!
shwonk