I'm running Windows 10 1903, the problem appeared after installing update KB4507453
The Windows Audio service wouldn't start, I solved the problem by changing the "log on as:" from user to local system account. Windows reports no error anymore but no sound coming out of my speakers (SPDIF)
The problem is not driver related, I reinstalled the drivers, downgraded to an older version and upgraded to the newest WHQL drivers, Windows reported no errors.
I tested my audio with Adobe Audition where audio is played by the [ASIO] library instead of the Windows [MME] system, the audio works perfect!
I installed the ASIO4all plugin in Winamp and also here audio plays perfectly.
So the problem lies on the Windows MME or WASAPI system (don't know what is actually used by Windows programs), in Audition the MME system reports: "The default output device is not responding and may be disconnected..."
In the Windows Sound configuration applet the in- and output devices appear as usual but no sound is detected in the microphone or no sound is outputted in the playback device when I play audio trough a DirectSound output (a normal Windows program).
When I try to play a test tone in the Advanced tab of the Windows Sound configuration applet I get an error dialog that says: "Failed to play test tone".
I tried uninstalling the update that caused the problem but without result. Reinstalling it also gave no result.
My previous Windows Image is from one month ago so I would prefer to solve the problem instead of reverting to the one month old image.
Are there any things I can do to investigate or solve my problem. Reinstalling Windows is no option for me as my Windows is highly customised in many many years.