The problem is in the rear of the drawer there are plastic locking latches and sometimes these Latches are not in the normal position (Locked when the drawer is open. You will need to remove the drawer and open the receiving latch installed on the cabinet frame at the rear of the drawer. On the drawer itself you will see a plastic small hoof that locks into the receiver on the cabinet at the rear of the drawer. Hope that this makes sense.
__________________
|