[nickredding]

Kovid - I dowlnloaded 10042 and this is what I get from the Kindlegen 1.1 generated file (using my method ebook-convert --> OEB --> Kindlegen) that is attached.

C:\Users\Nick\Calibre-Kindle\News-Files>calibre-debug --inspect-mobi nyt.mobi
Python function terminated unexpectedly
  Dont know how to interpret flag 0b0010 while reading section transitions (Error Code: 1)
Traceback (most recent call last):
  File "site.py", line 132, in main
  File "site.py", line 109, in run_entry_point
  File "C:\Users\Nick\calibre\src\calibre\debug.py", line 236, in main
    inspect_mobi(opts.inspect_mobi)
  File "C:\Users\Nick\calibre\src\calibre\ebooks\mobi\debug.py", line 1466, in inspect_mobi
    print(str(f.tbs_indexing), file=out)
  File "C:\Users\Nick\calibre\src\calibre\ebooks\mobi\debug.py", line 1173, in __str__
    ans += self.dump_record(r, dat)[-1]
  File "C:\Users\Nick\calibre\src\calibre\ebooks\mobi\debug.py", line 1224, in dump_record
    dat['geom'][0])
  File "C:\Users\Nick\calibre\src\calibre\ebooks\mobi\debug.py", line 1314, in interpret_periodical
    byts = read_section_transitions(byts, ssi)
  File "C:\Users\Nick\calibre\src\calibre\ebooks\mobi\debug.py", line 1245, in read_section_transitions
    raise ValueError('Dont know how to interpret flag 0b0010'
ValueError: Dont know how to interpret flag 0b0010 while reading section transitions

Everything is OK with MOBI's generated by (standard) Calibre.