Voice not working

Hi! In my multiuser app, voice chat used to work fine, but now nothing works anymore since an unknown change (and there were many) -- I can't hear my echo, I can't hear others, no matter which device (all of which allow mics) I'm testing with. I'm not even sure where to start debugging, but maybe my setup below -- showing two different users seated opposite each others, running simultaneously -- can help give some clues of what I'm doing wrong? Thanks! (The Universe node, which exists right from the start, has the Photon Voice Network and main Recorder. The Person node, which is instantiated after the Photon Room was successfully joined, sets up the body with head containing the Photon Voice View and Speaker.)