Norton Internet Security 2010 Parental Control

I have recently installed Norton Internet Security 2010 (version 17.1.0.19)

I have added the Parental Controls add on pack (version 4.1.0.10).

 

I have set the parental controls to "child" for each of the accounts set on the computer, however this is not blocking some sites under the "sex" categories as it should. I have run Liveupdate and everything appears to be up to date. 

 

The previous installed version on the same computer, Norton Internet Security 2009 and its associated Parental Controls add on pack, worked fine with the exact same settings and did block some of the sites that are now not working with the latest version.

 

I have uninstalled NIS 2010 and also used the Norton Removal tool. I have re installed NIS 2010 and the add on pack but it is still not blocking all of the sites that it should.

 

Any advice greatfully receive, thanks