On Thu, 28 Dec 2017, Paul A. Rubin wrote:
If you're using BibTeX, the BibTeX file could be the culprit. Sometimes people copy citations (or parts thereof) from non-text sources (e.g., PDF files) and paste them into a .bib file. They look benign, but there are character codes (ligatures come to mind) that prove indigestible to BibTeX. There could also be a nonprinting character mucking things up.
Paul, As I just posted to the list, I think that's the problem. Exporting the .lyx file to plain .tex and running pdflatex against it shows undefined citations.
If the glitch is in a BibTeX reference, I would open the .bib file in a plain text editor (or a hex editor, if I were feeling geeky) and look for stray characters that look out of place. If the glitch is in the document text, I would open the .lyx file in a text editor and snoop for stray characters in the vicinity of the glitch.
I don't have a .bib file, but the latex error suggested looking in the .aux file. My after-lunch work has been planned for me. Thanks, Rich
