Norton Online Family Blocks scratch.mit.edu as gaming site

I have installed Norton Safety Minder on the computers used by my kids.  In their profiles, I have not chosen to block "gamin.  g" sites.  Nontheless, the site scratch.mit.edu as "gaming."  I have also listed this site as one which my kids should be allowed to visit.  And, I have uninstalled and re-installed the  program and the problem persists.  How do I enable my kids to visit t his website without completely getting rid of the parental control program?