I did another apt-get upgrade today, and as expected, this bug was present again (at least 4 in a row now).
From suggestions in this thread, I ran it under LD_DEBUG=all, and captured stdout/stderr. This captured output is 481713 lines long, with the TLS error on line 26074 of that file. I really don't think submitting a 36 MB file is the thing to do, so I leave it to you guys as to whether this is of any use. Gord