Apple email message panel will not open. Sierra 10.12.6 MacBook Pro

Howie Kay
Howie Kay used Ask the Experts™
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I have a  MacBook Pro Running Serra 10.12.6.  My Email message panel will not open.
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Technician
Commented:
Mail opens? Preferences under Mail menu opens? View Menu drops down? Window Menu drops down?

Window Menu > Message Viewer [Command+O] will not open message viewer window?
Howie KaySystems Engineer Lockheed-Retired
Commented:
Hi Dave,
Thanks for your help.
Everything works as expected in my Apple Mail app with the exception of the message panel.   The panel cannot be expanded by trying to raise it from the bottom of the blank panel with the mouse cursor showing an up arrow.  In non classic view I am able to display up to 5 lines in the group email listing panel.
Howie
Howie KaySystems Engineer Lockheed-Retired
Commented:
Sierra repaired the problem after several weeks.  It was fixed.

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