I vaguely recall this situation coming up before. Did you try to change your avatar from the GalCiv3 forums? I think I remember someone posting that they were able to get it to show up after logging into one of the other Stardock forums and changing it there. Unfortunately I can't remember which one it was. You could try forums.stardock.com or maybe wincustomize.com, or if all else fails ask on the Forum Issues thread under "Everything Else" on the Stardock forum.
