JSWolf:
It has indeed. I had a lengthy thread in the Calibre forum and discussed it in the thread with Kovid; and had private correspondence with him on same. I obtained approval from a client to use his books as testbeds for Kovid and sent Kovid the mobi made by Calibre that did not work, and the KindleGenned file, from the same ePUB originally, that did, so that Kovid could compare the Headers, and provided Kovid with all the correspondence by and between myself and Amazon.
This was discussed on the Calibre forum some months ago, when I discovered that I could not open a DRM'ed client file that I dl'ed from Amazon on K4PC. (Said Mobi having been made by Calibre from a Sigil ePUB). My original worked fine on both device and K4PC; but the client couldn't dl to K4PC...and about 3 weeks later, after MUCH correspondence with Amazon, it was determined it was the header space that causes the problems.
On a bright note, that plus another item got me my own Technical Account Manager there, at Amazon's Kindle Publishing unit, so that was a silver lining. For me, anyway.
In the interim, we've written our own clip, in-house, which now converts Sigil ePUBs into ePUBs that we then feed into KindleGen, and it works great; even generates a nice html TOC to make Kindle happy. Saves me about 20 minutes per mobi conversion, which doesn't sound like much until you do it 10 times a day. ;-)
Hitch
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