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Why does a font, which worked fine under 10.3 fail on Mac 10.4 (Tiger)?

April 26, 2017fail Fine font Mac Tiger worked

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Why does a font, which worked fine under 10.3 fail on Mac 10.4 (Tiger)?

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With Tiger (Mac OS/X.4) Apple added some support for OpenType. Some OpenType features are converted (at runtime) into AAT features. This is good, but not all features have corresponding Apple feature/settings, and not all lookups can be converted (conditional lookups cannot be). Unfortunately if a font contains both OpenType and AAT features Apple now ignores the AAT features (or so I have been told). The result is that AAT features, which presumably work, will not be used, while OpenType features, which are not completely supported and so won’t work, are used instead.