Hi & welcome to MRF.
You should have no problem programming with the Multimaus & TCS decoders.
The only thing I can think of would be to make absolutely sure that the programming track, wheels & pickups are spotless - AFAIK the power available on the programming track is less than "on the main", this is quite a common problem with other systems as well.
You could also apply a little dowmwards pressure on the loco when changing CV's to see if that helps - if it does then double check track, wheels & pickups.
Hope this helps.
You should have no problem programming with the Multimaus & TCS decoders.
The only thing I can think of would be to make absolutely sure that the programming track, wheels & pickups are spotless - AFAIK the power available on the programming track is less than "on the main", this is quite a common problem with other systems as well.
You could also apply a little dowmwards pressure on the loco when changing CV's to see if that helps - if it does then double check track, wheels & pickups.
Hope this helps.