Session not saving in Laravel 5.1

ok, so I'm trying to store a session at Login when someone Logs in. I'm storing the session, saving it, but at the next page, I can't retrieve that session. It's a null output. The storage folder is set to 775, so I don't see why it wouldn't be writing. Auth session get's wrote btw, it's just the Session::put() keys that aren't being stored. Below is the code:

LoginController.php

if(Auth::attempt(['username' => $this->user, 'password' => $inp->password, 'Login' => $this->acct]))
        {
            # [2]: If TRUE, Create sessions, redirect
            $authArr = SubUsers::join('sub_services as ss', 'sub_users.userid', '=', 'ss.userid')->where('sub_users.username', $this->user)->first()->toArray();

            // Create The Sessions
            Session::put('Username', $this->user);  # constant | User that's currently logged in
            Session::put('Account', $this->acct);   # changing | Account Data being passed to view
            Session::save();

            Session::push('Auth', $authArr);

            // Redirect
            if(Session::has('lasturl')){
                $lasturl = Session::get('lasturl');
                return Redirect::to($lasturl);
            }
            else { return Redirect::to($this->startScreen); }
        }

BaseAppController.php

public function __construct()
{
    dd(Session::has('Username')); # [ This Returns Null ]
}

UPDATE: Below is the session getting stored in the storage/framework/sessions folder. It's being stored correct:

a:8:{s:6:"_token";s:40:"dEf3bJ4vz9fjiUuVnjD5EKNIKgJ38UzgZ0q4aE7K";s:9:"_previous";a:1:{s:3:"url";s:43:"http://localhost:8888/alpha/public/settings";}s:5:"flash";a:2:{s:3:"old";a:0:{}s:3:"new";a:0:{}}s:38:"login_82e5d2c56bdd0811318f0cf078b78bfc";i:78;s:8:"Username";s:4:"demo";s:7:"Account";s:4:"demo";s:4:"Auth";a:1:{i:0;a:20:{s:6:"userid";i:78;s:7:"groupid";N;s:5:"Login";s:4:"demo";s:8:"username";s:4:"demo";s:8:"password";s:60:"$2y$10$9Q1/zGeRrrDwl2rfjmkIWuWv3V/LpgFVYR/68PjANCsIkKmIVRVAu";s:4:"name";s:11:"John Babtis";s:5:"email";s:16:"jo@relatient.net";s:14:"remember_token";s:60:"2dqaWk56uJ1ldTdHhLcGg5U47JGxAD7EKdqwlr5qpPMGat9BKpMTf8tDtUlL";s:13:"userserviceid";i:81;s:9:"SuperUser";i:1;s:13:"MasterAccount";i:1;s:14:"canCreateUsers";i:1;s:12:"canEditUsers";i:1;s:2:"hm";i:1;s:6:"demand";i:1;s:9:"pophealth";i:1;s:12:"appointments";i:1;s:7:"reports";i:1;s:8:"settings";i:1;s:12:"canEditChild";i:1;}}s:9:"_sf2_meta";a:3:{s:1:"u";i:1437755751;s:1:"c";i:1437755740;s:1:"l";s:1:"0";}}

回答1:

Try, username all lowercase. Remember, PHP is case sensitive.

回答2:

So to give a more accurate answer to navasd answer, Username was getting overwritten by the Guard.php in the Illuminate\Auth\Guard.php file.

It stores sessions by name and for some reason it was storing the Username as null and overwriting my Session::put('Username') session variable. Renaming it to 'username' has worked though.