I already did one of those tests, as I first just entered the DCC address of the loco with the Zimo decoder. When that controlled function F1, which turns a home brew sound generator on and off, but couldn't make the loco run or stop, I then tried adding it to the roster, with the same result.
The Lenz LE103s don't have any functions except the front and back lights. But, I can't control them, or make the locos run or stop. I'm not aware of anything else I can change, or would need to reset. But, I will try that, and then monitoring the JMRI message to the EasyDCC again.
I was hoping there was some subtle DecoderPro "thing" going on that might explain lack of motor control when there is control of functions. I haven't heard yet that there is one. Bummer!