Step 1: Cookies

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'. 

Step 2: Cache

Left-click + hold the refresh icon and select 'Clear cache and forced refresh'.

Step 3: Log in

Log in again.