How do I allow quotation marks in input text?

[Stephen Paul McNutt]

I've got a field into which users enter questions for a game, but 
single and double quotation marks don't display properly later when 
they appear in the game.  They become boxes.  Is this a font issue?  
I've tried several fonts.  I thought it was because the quotation marks 
were reserved characters, but they don't end the display of the string 
as I'd expect if they were.