Am Freitag, den 31.05.2019, 05:39 -0700 schrieb Rich Shepard:
> LyX is installed here with pdflatex as the default driver, accessed
> via
> Ctrl-x h.

With "driver", I do not mean the latex processor, but the driver file.

You need to pass the driver as a package option, e.g.

\usepackage[pdftex]{pdflscape}

> What I need to learn is why the second page of the MWE does not
> rotate into
> landscape orientation using pdflatex (and neither do the three
> landscape
> oriented pages in the real document.)

As said, your MWE outputs correct with pdflatex here (see attachment),
so I don't know how to help.

Jürgen

> 
> Where do I look for the reason?

Attachment: mwe.pdf
Description: Adobe PDF document

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Description: This is a digitally signed message part

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