My thanks to Jim Henderson, Duncan and Steven D'Aprano for their responses. The behavior was as described in Steven D'Aprano's links re Astraweb, including fragmented trees. I regret I do not remember the particular groups involved with the exact symptom I described, but any of the groups beginning msn.forum.science produce no response from Pan at all except to border the entire top right pane with ...................... which I assume means Pan cannot access their headers.
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