Just curious to find out if anyone else has seen this problem. I installed the Woopra Mediawiki plugin (admittedly a beta) in my Mediawiki 1.12 installation (admittedly an old one...) and found that it breaks the Special pages: they won't display when the extension is enabled in LocalSettings.php. Comment it out and they return immediately.
If anyone's found a way around this, I wouldn't mind hearing about it. :)
not a support question