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I am experiencing a problem for which I don't know how to provide a minimal example, and have no idea even where to look for a cause.
<div>I have been working on a book for some time, in which the individual sections are in separate files, named <section>.tex, and the accompanying exercises in files named <section>.ex.tex. The master file, CalcThree.tex, calls them via \input{<section>}</div>
<div>(resp. \input{<section>.ex}). Each of the individual files starts with</div>
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<blockquote type="cite">%!TEX root = CalcThree.tex</blockquote>
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<div>All of these are in a single folder.</div>
<div>I had a fully functioning version of this book, but need to do a major rewrite/revision. So I created a new folder, and am one-by-one duplicating the section files, moving it to the new folder, renaming the file <section>.tex copy (reps. <section>.ex.tex)
as <section>14.tex (resp. <section>14.ex.tex), changing the root to</div>
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<blockquote type="cite">%!TEX root = CalcThree14.tex</blockquote>
changing my \input calls, and doing my revisions there.</div>
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<div>All was going fine until I got to the exercises for the fourth section, originally in file dot.ex.tex. I have the following weird situation: if I hit the "Typeset" tab from file dot14.ex.tex, the compiler works away on compiling the book until it gets
to \input{dot14.ex} where it stops and gives me the error message: can't find file dot14.ex. Same if I typeset from CalcThree14.tex.</div>
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<div>What can possibly be going on, or more to the point, how can I work around this? I've tried various versions of explicitly adding the .tex to calls, renaming the file, etc., all to no avail.<br>
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