Hyphenation does not appear in PDF

I have a justified and hyphenated document that I am trying to export to PDF. When I do, the hyphens disappear. When I go to Print Preview, the hyphens are also not visible, even though the words have been broken up correctly. The hyphens appeared when I went through the Tools → Language → Hyphenation command. I need them to appear in the final document. How do I do this?

Thank you.

What happens if you change to a different font?
Try a few other fonts.