Here's the code I've put into the /var/www/sstripe/tutorial/code/ArticlePage.php file:

<?php
/**
* Defines the ArticlePage page type
*/
class ArticlePage extends Page {
static $db = array(
'Date' => 'Date',
'Author' => 'Text'
);
static $has_one = array(
);
static $icon = "tutorial/images/treeicons/news";
static $defaults = array(
'ProvideComments' => true
);

function getCMSFields() {
$fields = parent::getCMSFields();

$fields->addFieldToTab('Root.Content.Main', new CalendarDateField('Date'), 'Content');
$fields->addFieldToTab('Root.Content.Main', new TextField('Author'), 'Content');

return $fields;
}

}

class ArticlePage_Controller extends Page_Controller {
}

?>

I'd appreciate a pointer as to where I've gone wrong. Using version 2.2.2 in a Debian 4 environment.

Thanks!
Yardiff

More background that I should have provided. Here is my "ArticlePage.ss" file:
=============================
<% include Menu2 %>

<div id="Content" class="typography">
<% include Breadcrumbs %>
<h1>$Title</h1>
$Content
<div class="newsDetails">
Posted on $Date.Nice by $Author
</div>
$PageComments
</div>
=============================
When I manually tick the "Allow comments in this page" in the CMS and save/publish, it works for that page. So I know that the $PageComments section in there is correct and working properly.

It just seems to be something with my $default array section. Any ideas where I've gone wrong? It's driving me somewhat crazy. I know it'll be something so silly-simple that I'll end up feeling more like an idiot than I already am.

Thanks!
Yardiff