This does not fix the problem for me. Note that oddly enough I had this problem with an CM11A (I'm not sure what its default behavior is with AH). I figured there was something wrong with it, which is why I upgraded to the CM15A in the first place. Another thing that is odd, if I try and manually set the brightness from AHP, the light is always a lot lower than what I set it to. So at that point, the only way I can get the light back to 100% is to walk over to it and hold the button until it gets to 100%. Then I can use AHP to manually turn it ON and OFF and it always works.
Another clue is that for some reason any lamp or appliance module seems to react to the timer ON events. It is just the wall switches that refuse to respond to them. And I say "respond to them" because I set a wall switch to the same code as a light module, and again, could manually turn them both on and off, but when the timer ON command was sent, only the module would turn on. I have 5 wall switches, mostly new, and none of them will react to the timer ON events, yet everyone of them will react to the timer OFF command and of course I have tried 2 lamp modules and 2 appliance modules and they all response to both on and off events.
Note that I also have an RF->X10 module TM751 and it has no problem turning all the lights on and off, including setting the brightness using a Powerhouse 6 in 1 remote.
At this point I have literally spent hundreds of dollars on trying to implement home automation with X10. I had X10 working at my last house without too much problems (e.g. the occasional miss) with several lights so I know how you are suppose to set this stuff up (at least I think I do!). And yes I have an power phase coupler installed in the circuit breaker box to pass X10 signals from one phase to the other. Before I did that, I couldn't even manual control all the lights, which wasn't a surprise to me.
At this point I am at my wits in

, so I am will to try any suggestion anyone can provide. Thanks!