I used this build as a guide. I didn't need to file the board because I shifted the board to the right and made the pots a little angled. Moving the toggle switch does the trick!
Still not a clue as to what happened to this one, but I just boxed up the second board (Moonshot) and this one's working great. Thanks for your time and support, Robert.
I pulled both c101 and c5 (the strip had turned red indicating too much heat). There's only continuity on pins 3 and 5 on the tl072 socket. I've been staring at it all day and can't find any grounding issues...I've got another board, but I'm afraid to try it.