Audio in Editor suddenly stopped working

I am working on a project on UE V4.26 CHAOS because the harwdare target is old/low end so cant use UE5 and Chaos vehicle in 4.26 (non chaos) is too buggy/not working.

Working on this project since like 1 month ago…everything was fine…suddenly the project has no sound output at all. If i launch in the android device sound seems to work but is not working in the editor.

WindowsEngine.ini seems ok:

[Audio]
AudioDeviceModuleName=XAudio2
; Defining below allows switching to audio mixer using -audiomixer commandline
AudioMixerModuleName=AudioMixerXAudio2

; Defines a platform-specific volume headroom (in dB) for audio to provide better platform consistency with respect to volume levels.
PlatformHeadroomDB=-3
UseAudioMixer=true

If I create a new fresh project in this UE version sound is not working neither.
I uninstalled this UE version and reinstalled…problem stills…

Sound works fine on normal UE4.26, 5, 5.1,5.2, etc…just stopped working on 4.26 CHAOS
and is not fixing even uninstalling/reinstalling the engine.

I suspect something broken in the program and some dirt remains somewhere because it was working and now uninstall/install dont fix it. Other UE installed builds work normal.

I create a new empty project for testing and is not working.

Any help?!
Thanks!

Dany