No X10 switch that I have ever seen only responds to a All Lights On and not a specific address also.
Since A All Lights On works. Try all the unit codes 1-16 and see if it responds to any of them. Unit 13 is the code if the dial is completely disconnected.
Thank you! I have a wall switch on address J3 which has been broken for a couple of years. It responded to J All On/All Off, but not to its address. It is behind a piece of furniture which would have had to be disassembled to get to it, so we've just been living with the fact that we couldn't toggle that light without doing All J Lights on/off.
Thanks to your post, I tried J13, and it worked! Hallelujah! I added a macro in AHP to translate J3 into J13 and my life is complete! I thank you and especially my wife thanks you!