Same problem exists in this GROUP BY clause, here's my modified GROUP BY clause for 8.4:

GROUP BY custinfo.cust_name, prjtask.prjtask_id, addr.addr_city, addr.addr_state, cntct_name, prjtask_number, prjtask_status, prjtask_name, prjtask_descrip, prjtask_due_date, prjtask_assigned_date, prjtask_start_date, prjtask_completed_date, prjtask_hours_budget, prjtask_hours_actual, prjtask_exp_budget, prjtask_exp_actual