This knowledge base is being phased out. The most recent version of this article can be found on Reset SessionID.
Open the browser developer menu (F12) and go to Application. Then select under Storage -> Cookies -> https://<your_domain>.mopinion.com. Then delete all cookies with the name 'AWSELB' and 'PHPSESSID'.
Left click + hold the refresh icon and select 'Clear cache and forced refresh'.
Log in again.