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'.
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Step 2: Cache
Left-click + hold the refresh icon and select 'Clear cache and forced refresh'.
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Step 3: Log in
Log in again.