WS12A does not have a neutral connection and I don't think the WS13A can work
at all without a neutral, since in the ON condition it's internal electronics would have no return path.
anhnn100
Are both switches operating properly when using local control at the switch? If so, it could a switch ID problem in AHP, or I would also suspect phase coupling problem (CM15A on one phase and the 3-ways or on the other phase) OR a noise problem.
http://jvde.us/x10_troubleshooting.htmDo you have any RF remotes like Palm Pad or Key Chain remote? If so make sure the CM15A is set to transceive the House Code the 3-way switches are on and move the CM15A to other areas of the house using the RF remote to activate the 3-way's.
Sorry, posted before reading your response.
Is the CM15A your only transceiver?