strange ACL problem

HI all,

I have installed Squid/2.1.PATCH2 on a redhat 5.2. I have also setup the "Blocking porn and related sites on", kindly made by Orso:
acl notporn url_regex "/usr/local/squid/etc/notporn"
acl porn url_regex "/usr/local/squid/etc/porn"
http_access allow notporn all
http_access deny porn all

I have downloaded the notporn and porn file, and installed them the right place.

If I try to access http://www.adult.com if get the mesg "ACCESS DENIED!" which is fine and expected.
If I try to access http://www.image.dk/~sbn/steen.htm, I also get the mesg "ACCESS DENIED!", which is not expected. I have tried to put http://www.image.dk/~sbn/steen.htm into the notporn file, with no result. The only way I can access this very friendly page, is by removing the "http_access deny porn all" from my squid.conf.

Any idea's?

Thomas