I'm sure you have solved your problem by now, but I have recently bpought the MX 500. After reading about your problem I have reading the manuel because I was having a problem. I went to Page 30 in the manuel "ogram the Macro Buttons ". Instead of using the Audio device as they did, I went to TV to DVR to Cable, using the same instructions but leaving out the audio and programed it to M1. The above devices turn on and off using the M1 Button, and all functions operate.