Firstly may I thank P-Henny for your reply to my posting. I have tried all of your suggestions to hopefully correct the issue I have but, I'm afraid I have had no joy. Over the last two days I have now tried to send a "Help Request" to RailMaster using the internal route. But, although I have set the settings in my Windows Defender Firewall to allow communications to RailMaster, it has always failed as "unable to send" Help message. Here is a copy of the message I have been trying to send to Railmaster; Hello Hornby RailMaster Help, The issue I am having started about five weeks ago when I had an electrical short caused by a faulty soldering on a TTS Sound Decoder fitted to a Hornby Locomotive. I was able to clear this and have since discarded the TTS Sound Decoder. But when I was powered up again, I noticed that the DCC functions ie, the directional and interior lighting did not work on two of my DCC fitted coaches, although four other Bachmann DCC decoder fitted coaches with directional and interior lighting on my layout were working as they should. Then, when I tried to reprogramme the coaches, although the CVs seemed to be read correctly and written to the Decoder, when the were placed on to my running track layout, none of the functions worked. I soon found out that any locomotive that had not been programmed before the “short” could not be programmed and added to my layout. Locomotives that had been previously programmed and added to the Elink list when placed on my running track are working fine. I thought my issue may have been with my Elink Controller, USB cable, programming wires and track, therefore I replaced them all with new components, but to no avail. I have posted twice in reference to this issue on the Hornby RailMaster Forum under the name ModelHawk216 and have followed the reply suggestions of Factory Resetting the decoders etc but with no joy. I really hope you can help as I do really enjoy using the Hornby RailMaster and Elink system and would be very reluctant to change to another system. Best regards Richard Smith. I am hoping that someone can suggest a solution to my issue as I have stated before I do not want to give up on my Hornby RailMaster Elink system. I still feel that it may be be something minor that it causing the problem. As why is it that all previously programmed locomotive decoders are working fine, but new locomotives with factory fitted decoders cannot be programmed by my new Elink controller since the electrical short some six weeks ago. I may be clutching at straws here but, can a electrical short deregister RailMaster and although I can run the previously programmed locomotives I am unable to programme any further models. I thank anyone who has taken the time to read my posting and hopefully can past on some advice and help to me.