[bruce]

Here is a strange thing that has been happening recently. My pdf documents have been printing in landscape mode. If I open a pdf document and go to File/PageSetup, the landscape mode is shown. If I then select portrait mode and print, the resulting printed page is in portrait mode. If I close the file and open it again and go to File/PageSetup, the landscape mode is shown again. If I save the file before closing it, the same thing happens. No doubt this started happening several weeks ago when I wanted to print some spreadsheets in landscape mode, but I must have changed some preference and cannot see how to change back to portrait as the default mode.

[bruce]

I have stumbled onto a resolution of my problem:
I open a pdf file. I go to file>page setup. This shows
a landscape orientation. I click on the portrait orientation.
Then, before clicking OK in the page attributes page,
I go to Settings, at the top of the pane. I click on
"Save As Default", and then click on OK. This saves the
portrait orientation, not only for this pdf file, but for all pdf files!
Seems amazing, but that is the way it is working out.