That was it! Thanks so much! I see from the discussion on the bug report you showed me that this has been a known issue for some time. Perhaps the GUI for paprefs could be amended to show a warning about enabling this option?

Thanks again for your quick and effective help,

John

On Wed, 9 Nov 2016 at 23:08 <bugzilla-daemon@freedesktop.org> wrote:

Comment # 1 on bug 98649 from Tanu Kaskinen
Did you enable "Multicast/RTP" in paprefs at some point? If yes, this is
probably the same problem as has been reported here:
https://bugs.freedesktop.org/show_bug.cgi?id=44777
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