Yes, I flash the Arduino to reset the serial number to a40h-001. I used this tutorial: nomeist.com/flashing-your-arduino/130
the values do not appear when I press the buttons, the values appear when I pull out and put the flat cable in the Arduinome Shield. Because that, I think Shield is ok, and the problem is with the Led Button. You have photos from your Pad for comparing the placement of components?
Sorry, but I don’t have a good writing english 
Tomorrow I will try Arduinome with Monome Serial.
tnks,
Alan