One of my members got the same error. I just asked him how he fixed it and he said:
If the person is using Symantec/Norton Privacy Control (which is a part of the larger Security Suite) then they have to add the [site URL] to the list of websites, and then adjust the settings accordingly, such as allowing cookies to be set, etc. so that it works.
Again, I'm a bit surprised this came up, since I've never had a problem with a message board and my firewall until this new version of the BB, so it must be the UBB software causing a problem.
Maybe that'll help, too... good luck!
