Ah, I see. And there's no way to turn transcluding
off? I can't find
a configuration setting for it.
Turning transclusion off entirely would be a bad idea, as it's one of
MW's most powerful features.
However, there's $wgNonincludableNamespaces (MW v1.10+):
http://www.mediawiki.org/wiki/Manual:%24wgNonincludableNamespaces
-- F.