Have installed Mageia 7 and all looks well, except that my USB speakers now produce no sound. Using PilseAudio volume control, I made sure (under Configuration tab) that USB audio is set to "Digital Stereo (IEC958) Output" (the only other option being "off" and that all other possibilities are set to off. Under both Output Devices tab and the Playback one, I can see sound apparently being produced, but the speakers remain silent.
To make sure there were no legacy issues, I moved ~/.config/pulse out of the way, let the system create a new one and again made sure things are set up as per above. Still no sound.
Any suggestions?