"Are the lights on ceiling fans?" - No.

"Your coupler could increase the signal level enough to solve the problem so that's worth a try. You can also try filtering other noise sources to bring your total noise level down."

I don't know a lot about the 'internal' workings of X10, but why would the coupler matter? The light responds to any controller that is plugged into the wall. It won't respond to any wireless ones that use a tranceiver.

I am going to install the coupler this Thursday or Friday. Hopefully it will work.

Thanks for the help