I don't touch cron. I have ran update script of course. You have to ran to update database.
in databasemysql.inc
trigger_error(check_plain(mysql_error($active_db) ."\nquery: ". $query), E_USER_WARNING);

echo $query;

I have strange output of $query:
in Firefox and IE too INSERT INTO sf_system (name, description, type, filename, status, throttle, bootstrap) VALUES ('u�_alter', 'Des', 'module', 'sites/all/modules/u�_alter/u�_alter.module', 0, 0, 0)