On Nov 5th I installed LEAP 42.3, and immediately checked Skype, as Skype sound problems are the main reason I'm changing distros. I called the testing service and the sound worked.
On Nov 7th Skype was updated.
On Nov 12th I tried to use Skype but the other end could not hear me. The display claims that speakers are muted, which they are not, as I could hear the other end perfectly. Checking with pavucontrol the webcam mic is active.
There is any amount of advice around, mostly rather scary, and applying to older versions of both Skype and openSUSE.
Before I do anything drastic, does anyone have any ideas as to what has gone wrong since Nov 5th, or how I can find out?