The problem is with the STIX fonts on your system. STIX comes in several forms. The original form was a set of 29 fonts with names like STIXGeneral, STIXVariants, and STIXSizeOneSym, each in its own font family. Recently, they were repackaged into a set of 5 fonts in families STIX and STIXMath that are designed to work with Microsoft Word. Unfortunately, ...


It seems as though reloading the page resolves the issue. But this never used to be necessary. I will keep myself posted, and thanks for the suggestions.

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