Smallfry, please move tho photo with your efforts here, since the other thread is so much overloaded.
As far as I can see you put the teensy on properly, but did you solder in the 2.2k resistors? Maybe they are needed.
Also, how did you install the diodes? Cathod (side with line marker) should point to the square soldering pad. I see a diode in your photo but can't see the line, there is a faint line that seems to point to the wrong side, but could be a photo artifact.
Anyway, all I can say is half an ergodox, ie the right side by itself works fine without the left side being connected.