Visit http://livingstyleguide.wmflabs.org/wiki/Special:UserLogin and try to log in.
Result: get pink
Login error
livingstyleguide uses cookies to log in users. You have cookies disabled. Please enable them and try again.
But on visiting that page I have a cookie,
livingstyleguidewiki_session=c6fc40646d029aef8b48f38a7139422f; path=/; domain=livingstyleguide.wmflabs.org; HttpOnly
Confusingly, the same error message is reused for nocookiesforlogin, the error when there's a failure to getLoginToken() from _SESSION.