I have fixed the PCB bugs listed on the website, I even tried both capacitors on
C23. No change in behavior.
Pictures of the PCB I have are here. I'm totally sure that I installed the switch correctly, it's on the component side with everything else. I didn't use the switch recommended on Jed's website, instead I got one of these switches, but from what I can tell they're electrically the same.
Another thing that I noticed is if I start the polysix in test mode, I can switch it back to normal mode once it's on and it still works normally. It's almost like the switch has no effect. However, if I start the polysix switched to normal mode, it does not work, and if I try to switch it to test mode while it's still on, it still doesn't work.