Online Family for Windows XP not blocking anything

I just installed Online Family in a Mac and in two Windows XP machines I have at home. In the Mac it works very nicely. But in the Windows XP machines, I can see the site [Removed] (or others similar I tried)  is not blocked in any of my kids' accounts (whereas it is blocked on the Mac). I installed a local account for each of my kids and set "block sites" in the settings page. Most importantly, the settings page says my kids are protected in all 3 machines and when I login in their Windows XP accounts the OnlineFamily message indicates they are protected.

 

Unfortunately, they are not. Any pornographic site I tried went through without any message, just as if the software wasn't installed, when all messgaes say it is installed and running OK.

 

I would REALLY appreciate your help here.

 

 

[edit: Please do not link to websites containing graphic content per the Participation Guidelines and Terms of Service.]