I apologize. Setting important files to read-only ensures I do not change them without creating a new version, thereby invalidating existing dependencies.
It was my standard novel CSS file which had not changed in years. It did not occur to me to check if the file was read-only, which begs the question, why would a read-only CSS file cause this behavior? Sigil could still read it, and Sigil had no reason to alter or write over the file.
Again, thank you.
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