Dave,
It stuck at the volume setting that you had on the previous software release. I was fortunate that I was on 10, so it stuck on 10 and have been able to hear all.
I'm not 100% sure, but if you reformat the SD card (or format a 2nd card) and reload your PAWwith the current release, it defaults to 10. Perhaps Lee can confirm? Though pain to have to put all the settings in again, it's worth a try?