MS Word 2011, Mac, some characters revert to default font after input

A client is having a strange problem with a custom font and existing Word documents in Word 2011 on a Mac. When cent or schwa glyphs are input, with a keyboard or the Mac OS Character Viewer, they switch to the default font. This does not happen with new documents, only existing files. I have been able to reproduce the problem, and I can even input the glyphs in an old file if I use them in a new file first. The fonts work just fine in every other program, and all other characters in the font seem to work fine. Has anyone ever seen this?

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