.... I don't know what else it would be but I'm guessing its sucking up the signals? ...... Most things still work of the palm remotes, its just the triggered events that seem to be having issue.
X10 can act funny... but rarely in a way that can't be explained. The fact that "
Most things still work of the palm remotes" hits me as curious. If you have a true signal sucking issue... why doesn't it prevent the same signals [from the CM15A] from reaching the plugged or wired in X10 devices... despite how it is initiated [macro or PalmPad].
Noam has a good point about testing your theory before buying filters.
If testing proves that the new Spa isn't the culprit... it may still be the cause. Installing the new breaker likely caused the main breaker to be shut down... maybe more than once. Double check your macros if any run on your computer... and make sure your lastest macros are the ones updated to the (CM15A) interface. Then a do a complete gleaming (remove from PC, Power,USB, and battery removal) of the CM15A.