I updated and did a full upgrade on my rpi4 last night and the DAC+ADC PRO is now not working. I'm not sure what information might be needed to help, but here is what I have.
Static hostname: raspberrypi
Icon name: computer
Machine ID: 0f15b82bc30647588c8d398b56cfd38f
Boot ID: 31eff6a1208344608f00562c27ea690d
Operating System: Raspbian GNU/Linux 10 (buster)
Kernel: Linux 5.10.63-v7l+