CoreText CopyFontsForRequest received mig IPC error

Question

I've been working on a BIG project (there's no point of showing any actual code anyway) and I've notice that the following message appears in the logs:

CoreText CopyFontsForRequest received mig IPC error (FFFFFFFFFFFFFECC) from font server

The error pops up as soon as a WebView has finished loading. And I kinda believe it's the culprit behind a tiny lag.

Why is that happening? What can I do to fix this?

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P.S. Tried the suggested solution here to check whether it was something system-specific, but it didn't work.

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More details:

• The error appears when using the AMEditorAppearance.car NSAppearance file, from the Appearance Maker project. Disabling it (= not loading it all) makes the error go away.

• I don't really care about the error message, other than that it creates some weird issues with fonts. E.g. NSAlert panels, with input fiels, show a noticeable flicker and the font/text seems rather messed up, in a way I'm not sure I can accurately describe. (I could post a video with that if that'd help)

Answer 1

This is probably related to system font conflicts and can easily be fixed:

1. Open Font book
2. Select all fonts
3. Go to the file menu and select "Validate fonts"
4. Resolve all font conflicts (by removing duplets).

Source: Andreas Wacker