Smart quotation marks

The smart quotation mark substitution is not working.

I have the option for Smart Quotes under Substitutions checked/ticked. It is also checked as active in system preferences/keyboard/text. The smart quotes appear Apple’s Pages app.

I don’t have any active clipboard managers running.

Sometimes typographic puncutation substitution can stop working mid-session. If you restart the program does it work again?

You are a genius. A restart cleared it up. It’s funny how that’s the last thing you think of!

Many thanks.