MyBB Community Forums

I'm trying some local developement, so I made a full backup of my running mybb online, started everything locally with wamp.
Files are stored in c:/wamp/www/mybb/ url is http://localhost/mybb/

I did change my settings to :

$settings['bburl'] = "http://localhost/mybb/";
$settings['cookiedomain'] = ".localhost";
$settings['cookiepath'] = "/mybb/";
$settings['cookieprefix'] = "";

But I'm still getting session error message / auth code error and login to admin panel works but I'm logged out if I click on any other menus.
Any help appreciated 

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EDIT: Alright I tried on another session in brave, then tried chrome and opera same problem.
Working with firefox so I'll stick with firefox ^^

/inc/settings.php:
$settings['cookiedomain'] = "";
$settings['cookiepath'] = "http://localhost/mybb/";
$settings['cookieprefix'] = "";
$settings['homeurl'] = "http://localhost/mybb or "/";
$settings['bburl'] = "http://localhost/mybb";