Model function references not recognized

[eluser]Frank Cole[/eluser]
Hi all,

Looking for some help here. After my hosting provider upgraded to PHP 5.2.5, Models are no longer working as expected.

I made a fresh install of CI and modified the simple welcome script that comes with it to demonstrate:

Contorller: welcome.php

Code:

<?php

class Welcome extends Controller {

        function Welcome()
        {
                parent::Controller();
        }

        function index()
        {
                $this->load->view('welcome_message');
                $this->load->model('Welcome_model');
                $this->Welcome_model->helloWorld();   // The Model error occurs here...
        }
}
?>

Model: welcome_model.php

Code:

<?php

class Welcome_model extends Model
{
        function Welcome_model()
        {
                parent::Model();
        }

        function helloWorld()
        {
                echo "Hello World!";
        }
}
?>

Error: from CI and PHP debug

Code:

A PHP Error was encountered

Severity: Notice

Message: Undefined property: Welcome::$Welcome_model

Filename: controllers/welcome.php

Line Number: 14

Fatal error: Call to a member function helloWorld() on a non-object in /www/htdocs/system/application/controllers/welcome.php on line 14

PHP Version 5.2.5
CI Version 1.5.4

Please somebody tell me there is some really simple fix to this.....

Frank