Originally Posted by Rick
The active topics looks like a language file didn't get uploaded. Not sure how it let you go through the upgrade script without it, but the languages/english/activetopics.php language file appears to be missing or empty.

The file is there and says:

PHP Code

<?
$ubbt_lang['FORUM'] = "Forum";
$ubbt_lang['POSTED'] = "Posted";
$ubbt_lang['JUMP_NEW'] = "Jump to new posts";
?>