Missing children

Ever since I upgraded to the latest version (3.0.0.52), 2 of my children don't show up when I log in to review their usage.  I tried logging in as them and it references that they are logged in and it blocks sites, but I don't see them showing up on the server.  Is anyone else seeing this behavior?  Any idea what could be wrong?  I've checked and all the computers are using the right version, but the kids still don't show up.