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fuel/modules/fuel/config/fuel_constants.phpwhere BASE_URL is being defined. You can see that my SCRIPT_NAME is strangely being returned as my drive letter followed by the script which is what is causing the strange behaviour.
$_SERVER['HTTP_HOST'] // local.dev basename($_SERVER['SCRIPT_NAME']) // index.php $_SERVER['SCRIPT_NAME'] // C:/index.php str_replace(basename($_SERVER['SCRIPT_NAME']), "", $_SERVER['SCRIPT_NAME']) // C:/ BASE_URL // http://local.devC:/
http://local.devC:/fuel/login/devwhich breaks the urls.