Some characters (* + - /) not displaying
I have a book about coding that puts the code examples in a different font (mono-spaced). The code examples show up fine - except the math operators are not visible. The dead-tree version of the book does not use a different colour for the symbols. I know the symbols are actually there because if I copy/paste out of Calibre the correct symbols are pasted. I used the book editor to view the html source - I can't find anything in the html that would cause the operators to display any differently.
Any ideas?
Calibre 2.37.1
Windows 7
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