Thanks very much for all the great responses!
Just as a follow up it is all my engines that have seen this problem but it turns out to be different problems. I should have deployed my Fluke multimeter the first notice of problems but ...
So on quite a few of the Ross switches including what to me looks like one of my new ones, the center rail does not have continuity (electrical contact) from one side of the switch to the other. So I will solder some wire to fix that. I also am seeing that the outer rail (the one acting as an antenna for tmcc and legacy control signal radiation) is not continuous either for some of the switches. I cannot say that this is not some modification of the previous owner (most of the switches are used and some definitely show signs of mods) but it does not matter. I need them to work and I dont mind soldering, quite the opposite in fact.
The switch that was shorting went back with the group in box of about 15-20 Ross switches that I had purchased in the last two years while waiting for a layout loft to be built, so I dont know what was going on with that but some time this weekend I will see if I can meter out all the switches and leave myself notes (if I dont I wont remember a thing!).
Thanks for all the great suggestions and tips!