I checked out your suggestion of "System Settings > Sound > Applications
and verify (while running) that the problematic applications aren't muted or
have different volume": check was Ok. I'll try the reverting to previous
pulseaudio suggestion later. I have a question. This PC doesn't play an mp3
file audibly either with usb speakers or with hdmi to a monitor containing
speakers. However, Sound Settings plays sound Ok when doing test of it. Also,
on another Ubuntu 16.04 computer (same make & model), with sound played through
speakers connected by jack plug to headphones/speaker output socket, mp3 files
played Ok with vlc. Is there a way of testing that pulseaudio is being used by
an app and/or the method of connecting speakers (i.e. usb, hdmi, jack plug)?
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No audio on vlc or videos sound or video files
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