Out of the sudden... I didn't noticed when it happened...I lost sound playback from all KDE apps (for example Amarok). I have sound from Firefox, Chrome, mpv, vlc but for example from Amarok or Dolphin preview player. I noticed that on Multimedia settings those applications do not appear when playing although amarok built in visualization works and tracks advancing like playing. All other apps appear normally on the Applications tab and you can mute or change the volume individually.
It is like KDE apps are not talking to the sound system at all but "think" that they are playing.
I don't know how to debug it. Any advice?
Thanks in advance.