It's mostly about SSO login. Sometimes I can log in normally but usually, it takes a couple of attempts and I have to clean cookies. Might be a consequence of switching accounts on eve official site. Not 100% reproducible, unfortunately. And I have heard more or less the same reports from other ppl as well.
I've encountered the same issue, but it seems that when you try to sso login from somewhere else than the landing page.
Most of the time if I'm directly in forums or somewhere like that, sso login isn't working. But if I go back to forums/index.php/portal/ it works fine.