I have experienced this problem more than once in the past, and I am now experiencing it again.

About 3 days ago I was listening to music on MixCloud.com through opera, as I have been for years. Opera is my main browser, though I use many others as well. Suddenly the music stopped. it shows as playing, but no sounds are emitted.

I receive my usual email notification sounds from Outlook. I opened Chrome to the same site, works fine.

I accessed the Windows 10 Volume Mixer which can have app-specific audio controls, no problems there.
The Opera "Additional Content Settings - Sound" -> nothing restrictive there.

I've explored all the possibilities mentioned in this thread. Nothing.

My opera://media-internals display looks identical to that of john-phd, with AudioServiceLaunchOnStartup = "Disabled" whatever that implies.

It's pretty weird that one day I'm booming along then whammo, Opera is silent with nothing to correct it.

I like Opera, but I gotta admit that I'm tempted to shift over to Brave as my primary browser, merely because it's working and I can just reopen my 110 tabs there and be off and running again. I haven't seen any real solutions on the web pertaining to this reoccuring problem. sad face.

@leocg You're right leo. I was mistaken. Sorry about that. You were responding to a comment by Derrek Tilbury.

@leocg You are suggesting a diagnostic test, not steps for reproducing the problem. There are not always steps for reproducing a problem. In particular this problem with Opera crops up, and then it's not working. Until you can get it working again, exactly how does one attempt to reproduce the steps that led to it mysteriously no-longer working. When I reported my version of the problem, I explained that yes the problem was exclusive to Opera.

I have experienced this problem more than once in the past, and I am now experiencing it again.

About 3 days ago I was listening to music on MixCloud.com through opera, as I have been for years. Opera is my main browser, though I use many others as well. Suddenly the music stopped. it shows as playing, but no sounds are emitted.

I receive my usual email notification sounds from Outlook. I opened Chrome to the same site, works fine.

I accessed the Windows 10 Volume Mixer which can have app-specific audio controls, no problems there.
The Opera "Additional Content Settings - Sound" -> nothing restrictive there.

I've explored all the possibilities mentioned in this thread. Nothing.

My opera://media-internals display looks identical to that of john-phd, with AudioServiceLaunchOnStartup = "Disabled" whatever that implies.

It's pretty weird that one day I'm booming along then whammo, Opera is silent with nothing to correct it.

I like Opera, but I gotta admit that I'm tempted to shift over to Brave as my primary browser, merely because it's working and I can just reopen my 110 tabs there and be off and running again. I haven't seen any real solutions on the web pertaining to this reoccuring problem. sad face.