[Lemming]

Hi all,

I'm trying to convert an opf file to a .mobi using ebook-convert, and I'm having a problem with nested navpoints in the ncx. Whenever I nest them like this:

<navPoint class='chapter' id='book-Z-H-9_chap_1' playOrder='5'>
  <navLabel>
    <text>1 Building Abstractions with Procedures</text>
  </navLabel>
  <content src='book-Z-H-9.xhtml#_chap_1'/>

  <navPoint class='chapter' id='book-Z-H-10_sec_1.1' playOrder='6'>
    <navLabel>
      <text>1.1 The Elements of Programming</text>
    </navLabel>
    <content src='book-Z-H-10.xhtml#_sec_1.1'/>

    <navPoint class='chapter' id='book-Z-H-10_sec_1.1.1' playOrder='7'>
      <navLabel>
        <text>1.1.1 Expressions</text>
      </navLabel>
      <content src='book-Z-H-10.xhtml#_sec_1.1.1'/>
    </navPoint>
etc etc

when I run Calibre I see the following message:

skipping class: chapter depth 3 at position 4
skipping class: chapter depth 2 at position 5

And these items don't appear in the navpoint list. It always skips ths items which contain other navPoints. Any ideas why? This is with 0.6.18 on OSX.

Thanks,
Colin