By default, MediaWiki's subpage feature is turned off in the main namespace, but can be used on talk pages and user pages. See Help:Namespaces. In namespaces where the feature is switched off, any slashes (/) within a
page
name are simply part of the page name and do nothing special.
To enable it on the main namespace, add to LocalSettings.php $wgNamespacesWithSubpages[NS_MAIN] = true;
Noted, thanks.
Ah yes, enabling subpages in the options.. that's the key. I forgot that was what drops in the automatic Breadcrumbs. Sorry :-P
C.