Seems to be due to this postParseLinkColour thing:

<a href="/~brion/head/index.php?title=Special:Categories&amp;article=Gato" title ="Special:Categories">Categories</a>: <!--LINK 14 Crap Crap-->

I'll leave the fix to those familiar with this new code.

-- brion vibber (brion @ pobox.com)