My apologies! I was communicating with a couple folks via PM / email and just assumed it was you!
There was a manufacturing defect on a few of the first batch of Sproing PCBs. Rather than sort through the entire batch I just tossed them all and reordered. I've been assured that the equipment failure that caused the issue has been resolved, but just to be absolutely sure I have moved the PCB production up to a higher class and opted for full 4-wire Kelvin testing.
Check to see if Pin 1 of the lower TL072 is shorted to ground.
If so, I'll need to get a replacement shipped out to you. I'm expecting them to arrive today.