First official post....
I am having this same problem, but my house was built in 1999. I have several lamp modules and one appliance module, all of them right now are running Christmas lights. I just got AHP with the new CM15A last week. I had issues on one PC with it working. The CM15A was plugged into a GFCI outlet, so I thought that might be the issue. I moved it to my other PC, and now I can get all but 2 modules working. The 2 modules happen to be in the same room.
I also have an IR mini controller that I have had for 10 years. It will work all modules just fine. In fact, if everything is OFF in AHP, and I turn on one of the modules with the mini wired controller that AHP will not control, when I look at the screen in AHP, it shows that the module is ON. So AHP is reading the status of the module, but wont control it.
I do not have a phase coupler, but I didn't want to shell out the money, because the mini controller will run all modules. I am wanting to add some more light switches to get the porch lights on timers, but done want to go there, unless I can get this fixed. Please help....