Issue with NCE Decoders

[Chuck]

Here is an interesting problem: Last night I had 5 locos on the layout -- two NCE decoders, 2 TCS, and one Digitrax. I placed one of the locos with the NCE decoder on the track and I think there was a momentary short -- the light on the Powercab dimmed for a split-second, but I am not positive. Anyway, the 2 NCE decoder engines no longer respond, but the other three work fine. If I tilt the NCE engines so half the wheels are off the track and then put it back down, sometimes it will take off down the track and then stop. Sometimes it will reverse for a short distance and then stop. THis happens whether or not the address is active on the throttle.

I thought it may have been my throttle since it is only affecting NCE decoders, so I reset the throttle according to the manual, but no change in the NCE decoder behavior. I also tried to reset the decoders to the factory default settings. The decoders responded and reset, but then no change in the decoder behavior -- no response to commands and runaways when tilted and reset on the track as above. I can change the CV's on the decoders -- the decoder makes noise and the CVs show the changes so I know the decoder is responding on the Program Track. Any ideas, or are my NCE decoders fried? If so, why not the other brands? Thanks for any advice you all have to offer!

Chuck