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[eluser]BrianDHall[/eluser]
[quote author="Michel-Ange" date="1258395965"]The only CI hack is in CodeIgniter.php :

Code:

// Load the local application controller
// Note: The Router class automatically validates the controller path.  If this include fails it
// means that the default controller in the Routes.php file is not resolving to something valid.
/*
if ( ! file_exists(APPPATH.'controllers/'.$RTR->fetch_directory().$RTR->fetch_class().EXT))
{
    show_error('Unable to load your default controller.  Please make sure the controller specified in your Routes.php file is valid.');
}
include(APPPATH.'controllers/'.$RTR->fetch_directory().$RTR->fetch_class().EXT);
*/

/**
* Begin addition
* Purpose: Enable Controller cascading
*/
if( ! $RTR->fetch_controller_path())
{
    show_error('Unable to load your default controller.  Please make sure the controller specified in your Routes.php file is valid.');
}
include($RTR->fetch_controller_path());

/*
* End Addition
*/

If you have another idea, I'm open to well coded suggestions ![/quote]

I believe I have a solution!

First, change the core file back to the way it was - uncomment the original code, and comment out the addition.

Then in application/libraries/Router.php, add a new function:

Code:

public function fetch_directory()
    {
        $folders = explode('/',APPPATH);

        $dots = '';

        foreach ($folders as $folder)
        {
            $dots .= '../';
        }

        if($this->module_path)
        {
            $path = $this->config->item('module_path') . $this->module_path . '/';
        }
        else
        {
            $path = APPPATH;
        }

        return $dots . $path . 'controllers/' . ($this->directory ? $this->directory . '/' : '');
    }

That's it! The trick is using ../ in paths. So first we reverse the effect that APPPATH/controllers has in CodeIgniter.php, then we proceed as normal. No other changes needed!

To start with, everything works perfectly.

EDIT: I had some other problems that were my own darn fault, had an old CI install on this one.