Stardock's Forums have a cookie/cookies to 'remember' which threads you have read [or not] when logged in. I'd expect your proggy is simply nervous [overly] about cookies.
This is an aside, but the forum recall of your thread reading is not cookie-dependent, or at least it works even when you dump all your cookies regularly.
Maybe the database behind the Stardock sites feeds cookie re-creation as needed, and that's what's making Norton balk?
@joelore: DrJHBL is being cranky, but I'll speak up in general support of Kaspersky. I'm too conservative to use anything but my memory for logins, but their suite is generally less resource-hungry than others and their UI is less cluttered with the 'helpful' stuff that gets in the way of actually understanding and controlling what your security software does.