Internet Explorer Program Rule Problem

I have a general dentistry practice and have 6 computers in a peer to peer network.  I have Norton Internet Security on three and Norton 360 on the other three.  Each computer automatically updated to the most recent version of the corresponding program.  Before the upgrade, on each computer, I had created a program rule for internet explorer which blocked internet access except to those web sites which I allowed.  This was very handy in that it prevented employees wasting time surfing the web, but they could go to the work-related web sites which I had previously authorized by this program rule.  After the Norton products updated, I am not able to get this to work as before.  I can block all access to the internet, but when I set it up to block access except to the web sites I authorize, it allows unrestricted access to the internet.  Am I missing something, or does this new version support this procedure?