Since you've excluded all other possibilities, it seems that the OSX version of azkcreator has a bug. (I used the Windows version.) Maybe you could ask another Mac user to install Kindle Previewer and convert your book with it.
(I could also create an .azk file for you if you pm me the file.)
Since there weren't any warnings or errors at the end of the build log and .azk files support most .azw3 features, your .azk file will probably render exactly as the corresponding .azw3 file.
Quote:
Originally Posted by mattmc
Additionally, and importantly, does Amazon actually still deliver .azk files to K4iOS apps?
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AFAIK, Amazon never delivered .azk files to iOS Kindle apps. They're only for testing purposes. Sideloading .azk files apparently forces the iOS Kindle app to generate the same file that readers will get, if they download a book for which a KindleGen generated .mobi file exists (which contains the old mobi7 and new mobi8/KF8/AZW3 formats) and their app supports the newer AZK/AZW3 format.