If you have hacked showthread.php, functions.php and especially db_mysql.php, I suggest upload unhacked versions of these 3 files and try again. If this does not help, I'd say fill a support ticket in vbulletin.com because if you didn't hacked db_mysql.php, it may be a vb bug. There are not many hacks that modifies "db_mysql.php" (Microstats is one) so your problem is really unusual..
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