CI 3.1.2 Unable to load any controller but default

Hi all,

I've been using CI 2.0 for a long time, but now that I have a new project I'd like to move to CI 3.0. I've downloaded and installed CI 3.1.2 and the welcome controller loads properly if I write:

http://example.com

Sadly, if I try to load it this way it fails:

http://example.com/index.php/welcome

So does all controllers I've tried to create. For instance I've created the following controller in the application/controllers/Test.php file:

Code:

<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');

    class Test extends CI_Controller
    {

        public function index()
        {
            echo "OK";
        }

    }

It doesn't load using:

http://example.com/index.php/test

But if I change default controller from "welcome" to "test" then it returns OK properly if I browse to:

http://example.com/

Also, if I run it from the CLI it works properly and again returns OK, no matter if is set as default of not:

Code:

php index.php test

I have tried to change $config['uri_protocol'] to QUERY_STRING and PATH_INFO without succes, I've tried to change base_url so its value is 'http://example.com/' instead of empty.

Server is a Raspberry Pi 2 using raspbian:

Code:

Linux raspberrypi 4.1.19-v7+ #858 SMP Tue Mar 15 15:56:00 GMT 2016 armv7l GNU/Linux

This is php version:

Code:

PHP 5.4.45-0+deb7u5 (cli) (built: Sep 18 2016 17:23:08)
Copyright (c) 1997-2014 The PHP Group
Zend Engine v2.4.0, Copyright (c) 1998-2014 Zend Technologies

I hope someone can help :-)