User logged-in status invalid directly after successful login redirect.

Steps to reproduce

1) Go to share.ez.no logged-out. Click login.
2) After redirect to ez.no login form provide valid login and password. Submit.
3) After redirect to share.ez.no it says that you're still out, however if you refresh (F5), it should change.

Unfortunately, this is not consistent. Maybe this only happens if you haven't used your account for a while.