--- lib-original.php	2011-06-02 10:28:17.000000000 -0600
+++ lib-modified.php	2011-06-02 10:31:01.000000000 -0600
@@ -648,7 +648,7 @@
             // Then left join with grade_grades and look for rows with null final grade (which includes grade items with no grade_grade)
             $sql = "SELECT gi.id, COUNT(u.id) AS count
                       FROM {grade_items} gi
-                      JOIN {user} u
+                      CROSS JOIN {user} u
                       JOIN ($enrolledsql) je
                            ON je.id = u.id
                       JOIN {role_assignments} ra