I have tracked this one down to newer Pillow versions actually importing from distutils just to spawn a process (not the right way!) and to check versions but only for jpeg and tiff images.
distutils is supposed to be used when a package is being installed, not for day to day working of the package. For that reason distutils was not part of the mac embedded Python interpreter as it should be unneeded by already installed packages.
I have now added back in distutils so that newer versions of Pillow will function.
This bug fix has been pushed to master and will appear in the upcoming version (non-beta) of Sigil.
Thank you for your bug report.
Last edited by KevinH; 07-02-2019 at 02:17 PM.
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