On a Mac Sierra 10.12.4 I am seeing the message that there is no MOBI importer. I have the latest Sigil and the latest KindleImport plugin installed, and I am seeing an error about a pyqt cocoa library not found.
This sounds like the same error being discussed in the DOCX import forum, having to do with new Sierra security measures. If is is the same error I will wait for further updates as the developers work through it.
Thanks....
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