I found the same error after the update but when clicking on Ranking tab only:
Database error in vBulletin 4.1.11:
Invalid SQL:
SELECT
u.userid,
u.usergroupid,
u.membergroupids,
u.username,
u.xperience_level,
u.xperience,
u.xperience_ppd,
u.xperience_awardt,
u.reputation,
SUM(s.points_user) AS points_user,
SUM(s.points_thread) AS points_thread,
SUM(s.points_post) AS points_post,
SUM(s.points_misc) AS points_misc
FROM xperience_stats AS s
INNER JOIN user AS u ON u.userid=s.userid
WHERE 1=1
GROUP BY S.userid
ORDER BY u.xperience desc
LIMIT 0,30;
MySQL Error : Unknown column 'S.userid' in 'group statement'
Error Number : 1054
Request Date : Tuesday, March 6th 2012 @ 10:55:01 PM
Error Date : Tuesday, March 6th 2012 @ 10:55:02 PM
Script :
http://www.xxxxx.xxx/xperience.php?go=ranking
Referrer :
http://www.xxxxx.xxx/xperience.php
IP Address :
Username :
Classname : vB_Database
MySQL Version : 5.0.95