Looks like a Mac. If so Sigil, is developed on a Mac and I have never seen this before. You may need to try changing your Mac system font settings and also use a Font Utility to identify and remove any corrupt fonts.
Yes, a websearch shows this problem happens on a mac because a bad/broken version of the actually requested font is present in the system. Fire-up FontBook on the Mac and have it test all fonts (in you home directory and system level) and disable the broken ones.
Last edited by KevinH; 03-03-2016 at 11:06 PM.
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