I am having the exact same issue with the hr21 using the mx6000... And I know it is the hr21 problem because the exact same macro worked flawlessly when I had a simple direct tv hd receiver... I have tried everything including adding delays to adding enter cpmmands...I will try the pinhole idea.... It is really frustrating... Question on the rs232.... I didn't know these units had rs232 interfaces.... is there a serial port on the back? I will check it out...