A lot of people, including myself, are having this issue. I believe the Chess.com staff are working on fixing it along with the messed up board colors.
Lost sound whilst playing
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If you need help, please contact our Help and Support team.
I don't have any sound when I or my opponent moves.
I do have sounds enabled under settings, and everything else about my computer and broser are working fine. It is only whilst playing chess the sound has gone.
Any thoughts ?