Scott, I do not know the reason why your PoKeys stopped working. I have told you if windows does not show the PoKeys then also upgrade is impossible. That is also the reason that I asked you to send me your device. That we can analyze it.
If voltage divider has bigger resistance than potentiometer, or you have longer cables in noisy environment, that could be a problem. Please describe both setups in details with some photo. 100n capacitor in paralel with divider could help. PoKeys is stable product and does n ot have any problems with stabillity. It shows what it have on inputs.