Understanding Surf Control Web Filter

We recently bought and installed this product, but I have a few gripes I’d like to air. Although name resolution works fine, where does it get it’s user group info from? I can add to it but cannot remove the old NT domain objects it drags up, therefore reporting is not accurate due to the amounts of groups an individual user belongs to. Also if someone logs on as local administrator Surf logs their internet usage under the last domain logged on user. This is a worry! Does anyone out there love this product and know how to make it work properly?