It's kind of a long shot, but cleaning the both circuit boards might be worth a try.
I built my second Ice Tube Clock using the Adafruit lead free solder and it didn't work. After scrubbing away the rosin buildup, everything worked perfectly. When the same thing happened on two additional projects, I started habitually cleaning my boards.
(Please note that I'm an Adafruit customer, but am otherwise unaffiliated with Adafruit.)