I had this happen to me. Here is what Logress told me when I messaged him
"This is generally caused by the login think someone is trying to mess with it. clear your cache, cookies, and go to http://www.alteil.com
click on the login link at the top and try again
It can be caused by not logging out properly with your alt, using the back button on your browser within the login, and sometimes going direct to the login screen from a bookmark when you have old cookies in your browser form your last login".
I am still having trouble with it, so if that doesn't work, I don't know. Sorry.