The KFX Output plugin makes use of an undocumented conversion function (KFXGenApp) within the Kindle Previewer for KPF conversion. The Previewer no longer uses this function itself and in the latest Previewer version (3.38) it contains a bug that leads to failure to convert some books that use SVG images. Since that function is now deprecated it is unlikely to be fixed in the future.
I intend to update this plugin to instead use the documented and supported command line interface (CLI) of the Previewer for performing conversion to KPF. Using the CLI will result in some changes to the functionality of this plugin since it lacks some of the conversion options that were available in the deprecated API.
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