Here is a dropbox link to my scrambled file.
https://www.dropbox.com/s/6up9vgjbj8...bled.epub?dl=0
Having seen the image provided by Quoth, I realized that "Preferences" in the editor are not the same as in the main Calibre app. I've been living in the editor for so long that I forgot there was anything else. So I was able to get ScrambleEbook at last!
To recap, my problem relates to page-break functionality. I realize that "avoid" is no guarantee, but none of the settings are working reliably. My situation is practically identical to what Scruffs posted a few years ago, but unfortunately the fix did not apply to me. But I am guessing the broader concept of the fix might. I just don't know how to approach it. I can follow instructions well, and I can muck around in html and css to eventually get the job done (usually). I learn on a need-to-know basis, and it works pretty well for me. But right now, with this page-break-inside/after issue, I am stumped.
Any help would be appreciated greatly, and with a solution, my wife will be able to take me off of suicide watch. … Ron