I've found a problem with the
Remove broken TOC entries in NCX file.
First thing, it doesn't fix the playOrder and leave things out of order. Second, FlightCrew is not liking things like </content>
Incorrect according to FC
Code:
<content src="OEBPS/Gaba_9780440335153_epub_qts_r1.htm">
</content>
Correct according to FC
Code:
<content src="OEBPS/Gaba_9780440335153_epub_qts_r1.htm"/>
The error FC is spitting out is
no character data is allowed by content model.
Once all these are fixed, I'd expect FC to complain about the playOrder not being in sequential order due to the removal of any unused entries.