I have since installed the decoder into the loco(older Genesis SD75I) and am still experiencing the same issues.? The unit is on the test track and even though the sound level adjustments actually save, I get a 308.? Being that this is both my first time at JMRI and DCC, I've verified the jumpers, power connections, etc. one more time.? The only obvious variance in implementation is the use of non-Arduino branded boards.? Is that a possible culprit?? I've seen videos of the Derek-Robot Motor Shield used before for DCC with no problems.? I also ran the initial Arduino Serial Monitor checks through the IDE before firing up JMRI and corresponding indicator lights blink, etc.
I'm stumped. :)