I have accounts both here and on Wolvden. When I have them both opened in two different tabs at the same time, BUT Wolvden was opened first, i get the "It looks like you're connected in another window." message. On the other hand, it doesn't happen when Lioden is opened first, and doesn't affect Wolvden either.
What could cause this? I know nothing about game development, but it seems possible to be connected somehow, since both games are by the same devs? Maybe?