So i had the weirdest issue today:
Last night, i installed vbulletin as i want to get a forum going for our new project: Dive: Frozen in time – a puzzle-driven skydiving game in Virtual Reality, made by our brand new studio: spinningBOX VR Studios and everything was fine. Went to bed and when i try to login – i can login to the website but not to the admincp. I was pretty amazed, however one really easy fix was this:
change your cookie prefix in core/includes/config.php to rewrite the cookie key.
$config['Misc']['cookieprefix'] = 'bb'; to $config['Misc']['cookieprefix'] = 'bb1'; Problem solved. Enjoy!