Okay: two problems solved. The squished running heads were caused by overset text not visible on the page being edited (the overset + did not show up). However, the Story Editor showed the overset text, and I was able to see that a couple of paragraphs had been mistakenly tagged with the the header_1_appendix style. I fixed that, returned the text variable definition to stock, and the word "Glossary" appeared -- but without the Appendix prefix or the number. I added the Chapter Number built-in text variable before the custom <appendix> text variable that I had pointed to header_1_appendix. However, this showed me 10: Appendix (the appendix being the 10th chapter in the book). Rather than set the text variable definition to alphabetic, I went to Document Numbering Options on the Book window, with the appendix file selected. There, I changed the Document Chapter Numbering for this file (and will to any other appendices) to A, B, C, D, and restarted chapter numbering at 1. I assembled the running head this way: I typed "Appendix", inserted the Chapter Number predefined text variable (set to follow the chapter numbering convention of the head), then typed a colon, then inserted the <appendix> custom text variable that picked the name up from the text with the head_1_appendix style tag. Thus, I had Appendix A: Glossary made up of two text variables and manually entered text. There may be a way to pre-pend Appendix automatically, but I'm not going to have all that many appendices in this document, so putting a running head in manually is not a problem, as long as the numbering and text pick-up work automatically. Remaining mystery: In the first part of the book (the chapters) the chapter number and the name of the chapter is picked up as I would have expected by the running header -- as 1 Users, 2 Accounts, etc., without using any multiple-text-variable running heads. They do not need to begin with "Chapter," and maybe that's the difference. At some point, I will straighten that out, but things are working for now. Thanks to all the forum members who helped.
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