I had a peculiar problem programing my 44t.  I could program all CVs except for the address by attaching my programming track to my rail power.   Tonite someone on another forum suggested placing a 1K resistor across the programming track.  I tried this and it worked perfectly.  I am finally able to program the 44t for the first time on the programming track and program all CVs. 

I just tried an experiment.  I disconnected rail power from my layout and fed my programming track from rail power.  I was able to program successfully in ops mode.

Works for me.

Has anyone programmed this with a Digitrax Zephyr?  I tried ops mode and the programming track and in both cases the controller says the decoder did not respond. 

The loco runs fine with the default settings, I just can't program it.