Say Don quick question I was just wondering think it might be the switch itself? I'm using those x10 Decorator Dimmer Switch, just ordered a couple Leviton 6381, look under modules lamps in Active Home Pro, these have that intellisense AGC (automatic gain control) for enhanced response to X10 signals. AGC adjusts receiver sensitivity to help eliminate noise interference and improve the overall performance of your x10 system wondering if the switch itself might be part of the problem and possibly the Leviton might perform better, I said part of the problem because the activity monitor did appear to indicate that the CM15a did send multiple dim commands, I also like the soft start feature, were it ramps up slowly, sweet! . Also tell me doesn't the CM15a have to be plugged into your computer to view anything in you activity monitor, for example to see the transmit and macro activity wouldn't you have to have it connected to your computer. Thanks
Tom j