Hello!
Could you share more details? Is this issue presented only on youtube?
Please, send us the diagnostic information, so we can look closely. You can find it by opening secure://settings/diagnosticInfo.
Or through the browser menu => Help and About Avast Secure Browser => About Secure Browser => Diagnostic information.
Youtube sound plays on Bank Mode but not on standard desktop.
Brighteon sound does play on standard desktop.
Avast Secure Browser is up to date
Version 103.1.17779.134 (Official Build) (64-bit)
Windows 10 pro.
VPN not on.