PROBLEM: A limited production of the NCE PowerCab were shipped with an incorrect chip installed that created communication problems with any expansion device connected to the Cab Bus. DCC accessory controllers are not effected. There is no way to easily tell if you have the wrong chip inside you PowerCab or not.
NCE CAB BUS ITEMS AFFECTED:
Expansion Cabs: ProCab, Cab04, Cab05 and Cab06
Radio: RB02 which is require to work with any radio based expansion cab.
Accessories: USB adapter, MiniPanel, AIU
For more information and the solution go here: https://sites.google.com/site/mgurriesncedcc/home/nce-problems/powercab-expansion