I thought it was just my viewer too.......I downloaded the newest Firestorm (50527) and each time I log in I get the pop up error about issues with the voice server (Vivox).....I never got this pop up until I downloaded the Firestorm version listed above......
I do ALT, Windows button and F6........then relog and it will come back normally. I have heard others who have this same issue. I have tried the TPing to a region to see if that helped and it didn't......still no voice.