Hi,
it looks like latest refactor broke logging out in a situation where you use a non-standard session cookie name, resulting in "Session Mismatch" errors on every pageview after logging out: https://forums.opera.com/topic/37044/pop-up-it-looks-like-your-login-is-no-longer-active
After investigation I believe the culprit is the hardcoded cookie name:
Fix_wrong_session_cookie_being_cleared_on_logout.txt
That fixes the problem for us.
Thanks @attis
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Thanks @attis