I have an X10 PLW01, basically a light switch. As a manual switch, it works fine. As an X10 device, it reliably accepts and reponds to commands to turn on, but seems to ignore all commands to turn off. Sending the commands multiple times doesn't help. I've tried multiple addresses. Other X10 devices are working reliably. I don't have any other PLW01s for comparison.
Is there any trick I should know? Or is this just a defective unit and I should return it?