Felix,
Well I know now why it started working correctly, the lamp in the button became disconnected when I removed and then re-installed the button. Re-connecting the lamp in the button causes a continuous detect to the BellMote..
Would it be possible you can check to see if you have a lighted button, please? I don't see how this would ever work when you have a lamp (resistance) across the switch. The lamp measures about 129 ohms