Surge protectors may absorb X-10 signals. Install
a whole-house surge protector near your breaker
box and get rid of the surge protector strips.
[Link: smarthome.com]Electric motors and some electronic devices may
generate noise that disrupts X-10 communications.
Use a filter line this one to block the noise:
[Link: smarthome.com]Steve
I have 2 X-10 both going into Radio Shacks best computer surge protector with no problems