Master/Child/Macro/Bibliography issues with 2.4

[Michael Dean Pugh]

I am having problems with LyX 2.4 that are so great that I don't even know where to begin to sort them out.  I have a LyX file which contains all the math macros I use regularly.  I have included (with \input) it at the very top of another document which is a LyX master document, containing only a title page, toc, lof, references to five child LyX documents (chapters. and here I used \include), and bibliography (thru natbib).  I am using svmono as the class file.  I used to have references to the macro file at the top of the five chapter files too, but this was apparently causing compilation problems, so I removed them.  But because the child (chapter) files were referencing the master document, which still contained the macro file as a child, they could still see the macros (bravo: that is exactly how it ought to work).

Yesterday, when I left school, this was working fine.  I saved everything and returned this morning and now nothing is working (this is not the only problem I am having, but I can only deal with one at time).  Now, when I try to compile the child documents individually they give LaTeX errors saying that the macros are not defined.  But the macros still work inside of LyX—it's LaTeX (well, technically, XeTeX) that is causing the problem.  If I put the references to the macro file back in the child documents, they compile individually (if I take out bibliography citations—this is one of the other problems)​, but then the master document will not compile.  It doesn't even given an error—it just goes forever into compile mode (wheel on task bar spins indefinitely).

So to recap:

Macro file and chapter files included in master file with (\input and \include, respectively) -> master compiles, chapters do not, but strangely, the math macros function correctly in chapter documents even though they do not​ individually include the macro file.  It is only when compiling that XeTeX says it cannot find the macros.

Macro file included in chapter and​ master documents and chapters included in master -> chapters compile (with bibliography citations removed) but master will not.

I guess I may as well include the bibliography problem here because it may be related.  In LyX, the chapters can "see" the bibliography entries just by referencing the master document if there is a \printbibliography command somewhere in the master.  I can see all the included entries when adding a citation and select what I want, just as it should work.  But when I compile the chapters individually, I get "citation undefined" errors in spite of this.  Compiling the master (if I remove the macro references from the chapters) works fine.

I have to believe that I should be able to include references to macros and bibliography in the master only and still be able to compile the chapters individually, especially since that functionality exists inside of LyX.  Only when trying to compile do problems come up.  And I could have sworn all this was working yesterday, so I am at a loss as to what happened.  How is this supposed to work?

One last thing.  Yesterday, I had the bibliography settings as Style Format -> Biblatex (natbib mode) and Processor -> default and it was compiling.  First thing today, having changed nothing, I got biber errors.  I assumed that biber was the default processor and changed it to bibtex.  Now it works.  But I had previously used the aforementioned settings religiously without error.

Thanks!
Mike Pugh
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