I used my hifiberry amp with the recent volumio version 1.51 (updated from 1.50) until this afternoon without any issues.
After installing a new router I had some issues to update my NAS Mount within volumio and ended up in a clean install from the recent Image (1.51).
Unfortunately the amp isn't recognized anymore if I select "Hifiberry Amp" from the I2S Driver list like I did before.
aplay -l output:
aplay: device_list:268: no soundcards found...
If I select "Hifiberry" aplay -l output after the obligate reboot is:
card 0: sndrpihifiberry [snd_rpi_hifiberry_dac], device 0: HifiBerry DAC HiFi pcm5102a-hifi-0 
Subdevice #0: subdevice #0
Obviously I get no sound output when selecting this entry.
I already tried to reflash the Image two times.
What steps could I try?