While I had only selected about 12 super/subscript characters in the SE
(individually) and clicked (off) and then clicked (on, again), when I
saved the .sla and re-exported the pdf 1.4/5, I was surprised to see
that most (?all - I'm not totally sure) of the super/subscript
characters on pages much later in the document from what I edited had
been exported this time properly in the pdf.
Perhaps this might indicate that just making one or a few changes in the
SE makes them all? convert properly? I don't know, but I needed to post