auth filter always returns true for guest()

[brazenvoid]

I have the following filters;

Route::filter('auth.biz', function () {
    if (Auth::biz()->guest())
        return Redirect::route('auth.marketer.login');
});

Route::filter('auth.back', function () {
    if (Auth::back()->guest())
        return Redirect::route('auth.back.login');
});

Configuration;

    'multi' => array(
        'back' => array(
            'driver' => 'eloquent',
            'model' => 'BackUser'
        ),
        'biz' => array(
            'driver' => 'eloquent',
            'model' => 'BizUser'
        ),
        'user' => array(
            'driver' => 'eloquent',
            'model' => 'User'
        )
    ),

    'reminder' => array(
        'email' => 'marketer.emails.resetPassword',
        'table' => 'password_reminders',
        'expire' => 60,
    ),

Both endpoints have separate login pages and they correctly authenticate validated users. Reminders also work correctly. Only Auth doesn't retain its state beyond the login pages. All routes for authenticated users, even those from login page get invalidated.