Problem with my Wireless Router - Website Blocking won't work

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I have 9 desktop computers connected to a router WRT54G-LinkSys with firmware version 7.00.00, April 11, 2006 and i setting/installing it by myself. My problem today is that its Website Blocking feature won't work though how many times i did update/change the Access Restriction option and the router confirmed that the setting was successfully changed. Few weeks ago, it was working very fine. Can anybody help me what's wrong with this router why it behaved this way... I am very much concerned because mostly of the users of these PCs are minors and i cannot control the sites they are visiting... I found out that they are visiting sites like xxx.com, 89.com, bangbros.com, etc... and i want to block access these sites. please can anybody help me...