I tried saving at each step, but it does not help: (1) Exported my InDesign CC document as an EPUB file; (2) I opened the file in Sigil; (3) I saved the file [also tried skipping this save]; (4) I generated the Table of Contents, Cmd-T; (5) I saved the file; (6) I selected None to delete the subheadings [also tried doing nothing]; (7) Sigil Quits as soon as I select OK, no matter what I do after Cmd-T.
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