OK, I know rule #1, clean track, I did that. so, I just got a new NCE NAVO decoder for my Atlas VO-1000. I carefully took the unit apart, installed the decoder as instructed, placed it on the tracks, lights flash, nothing else. I flipped my toggle switch back to straight DC, put the stock board back in, purrs like a kitten, switch it back to the DCC decoder, power up the Power Cab, lights flicker, nothing else...I only have one other DCC loco, and it runs fine. Went back to program and it says that it can't read the CV... Any ideas?