Mail works but there is no display.

I have a Macbook Pro running the latest update of El Capitan. I can launch Mail and see the banner menu, but there is no display windows. When I send a test email, I can see the notification. It shows the number of unread emails in the dock. How can I fix it?

What happens when you select "New Viewer" in the file menu?

Tags: Mac OS & System Software

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