Well I'm an idiot - the fulltext index on page_text was missing from a default installation. It didn't break searches but probably slowed them down tremendously. Also set engine to MyISAM on page_text to avoid cryptic error messages from MySQL.
<?php
class Text_Wiki_Render_Plain_Interwiki extends Text_Wiki_Render {
/**
*
* Renders a token into text matching the requested format.
*
* @access public
*
* @param array $options The "options" portion of the token (second
* element).
*
* @return string The text rendered from the token options.
*
*/
function token($options)
{
if (isset($options['url'])) {
// calculated by the parser (e.g. Mediawiki)
$href = $options['url'];
} else {
$href = $options['site'] . ':' . $options['page'];
}
return $options['text'] . ' (' . $href . ')';
}
}
?>