UI Text Not Showing Apostrophes and Quotes

I'm having a strange problem, and one that's only started occurring today, even though I've been using the same story system since October.

I'm writing a string to a UI Text element through code, very simply, like so:
For some reason, though the string itself has the correct punctuation, my text in-game won't display apostrophes or quotes in the text. I've checked the string through debugging and console output, and even, when running the...

UI Text Not Showing Apostrophes and Quotes