As far as I could see the CMS pages don’t show up in the breadcrumb trail when you view the page. Here is how I got them to display:
In the template.phtml that I’m using for my CMS managed pages I added the following code:
<li class="first"><a href="\">Home</a></li>
$_cmsTitle = Mage::getSingleton('cms/page')->getTitle();
echo "<li>" . $_cmsTitle . "</li>";
echo "<li>Shopping Basket \ Checkout</li>";
This sets $_cmsTitle to the page title set in the CMS, You can optionally have the else statement if required.