In the forum bit of a wiki forum, when the last post article has a prefix, the link doesn't include the prefix, so it points to the wrong article.
Fixed. In
vault/special_plugins_forumdisplay.php, find:
PHP Code:
$lastpostinfo['threadid'] = $lastpostinfo['lastthreadid'];
Add after:
PHP Code:
$lastpostinfo['prefixid'] = $lastpostinfo['lastprefixid'];