No his user name is "GrandPiano" (without the " ").. and am not sure if he's the only one who experienced this 'cause am not sure if everyone is using the login/logout hack.. it doesn't work for me anyway. When I try to login it just drops me to the main page but am not logged in. When I try to logout it just do the same and I am still not logged out!
I installed it 3 days ago hoping that its some kind of a cookie problem. I will check with my other visitors to see if they get the same error and will get back to you