Finally, in the latter part of last week, I got Thunderbird 52.7, which
has the fix to bug 1447360 (and other related bugs). It never did show
up in the Fedora 26 repository; I got it when I upgraded to Fedora 27.
I've been using Thunderbird 52.7 for several days now. I no longer see
the "CLIENTBUG" messages. The folder structure no longer gets erased.
This problem is solved.
My thanks to those who helped.
Bill.
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