John Blumel wrote:

Are there are known issues related to adding namespaces after a wiki has been in use for a while?

It's possible to add a namespace which conflicts with existing 'namespace-like' titles. For instance if you add a namespace 'Foo' and there's already a page 'Foo:Bar', that page is no longer accessible until you fix its database entries to reassign it to the namespace.

ie, it was recorded as (0,'Foo:Bar') where it should have (100,'Bar').

I've written a helper script to automatically search for and clean up such entries: you'll find it in the 1.5beta1 package as maintenance/namespaceDupes.php. It should also run on 1.4, if you copy it in.

-- brion vibber (brion @ pobox.com)