ппц
No sound in Live Chess
I found that if I login using a different browser for the first time I have sound but if I logout and then login again on that same browser the sound is gone. Also, I normally play 5 min chess but every time I login the time control defaults to 10 min. Really strange!

Looks like a Javascript issue. I suspect there's a race condition.
From the Chrome's JS console:
Uncaught TypeError: Cannot read property 'hasOwnProperty' of undefined
at Amplitude.n.getInstance (live:630)
at AmplitudeLogger.init (webpack:////www/sites/chess.com/releases/20170703151420/app/Resources/assets/js/web-es6/amplitude/amplitude-logger.js?:41)
at new AmplitudeLogger (webpack:////www/sites/chess.com/releases/20170703151420/app/Resources/assets/js/web-es6/amplitude/amplitude-logger.js?:25)
at eval (webpack:////www/sites/chess.com/releases/20170703151420/app/Resources/assets/js/web-es6/amplitude/amplitude-logger.js?:132)
at Object.<anonymous> (live-base.338ae8f1.js:1)
at n (live-base.338ae8f1.js:1)
at eval (webpack:///./src/base/es6/game/game.service.js?:13)
at Object.<anonymous> (live-base.338ae8f1.js:1)
at n (live-base.338ae8f1.js:1)
at eval (webpack:///./src/base/es6/chat/chat-boards-tab.controller.js?:19)

just a guess but unless this issue gets revealed at a major traffic site then, ya know, there'll never be a chess dot com explanation.

first i thought it is a joke, but in fact when you write
/sound
into live chat, than it first turns the sound off (event it is off), and writing
/sound
again turns the sound FOR REAL on.
Yes indeed. /sound in the chat box is the temporary fix. It even resets to the default time control I desire.

now both the defaults & sound work but i can't get the chat box to accept anything after i hit 'Enter'. The Enter key in the chat box isn't warking.

Guys try this...I changed my incoming challenge rating from -50 to infinity and saved it. Once I did that my regular time preference came up and the sound worked again. Try it and let me know!

Two different machines both with firefox have lost sound (but okay with analysis mode). Installed opera on both got sound for now. Definitely an update causing this as never had a problem before.

Some members in this thread have said that typing "/sound" in the Live chat helped.
You may have to do it twice if the first time turns the sound setting off.
lol
/sound