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I came across this on the Mediawiki list, and though that it might be related? <quote> Don't write anything like: $wgExtraNamespaces[NS_FOO_TALK] = "Foo talk"; # no underscore
but: $wgExtraNamespaces[NS_FOO_TALK] = "Foo_talk"; # with underscore
See http://www.mediawiki.org/wiki/Manual:Using_custom_namespaces </quote> Could be a total "red herring" of course