Amazon will be devastated! A TOC that only works on Kindle devices and software? I'm sure they will rush to fix i!. If only we could look at the source code.
I had not considered that the problem may lie with unpacking. Presumably there may in fact be a working toc which is not being unpacked or unpacked properly. For what it is worth, my inexpert opinion on the most likely explanation for the working TOC is that we might be seeing the result of some type of TOC fallback algorithm in the code which operates in the absence of a toc.html.
|