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Sierra Mail Preview pane stuck closed

For the life of me, I can't get Sierra's Mail Preview pane to open. I closed it so as to not load the contents of a spam email, then as I have in the past, I hover my cursor over the far right edge of the Mail viewer window, make sure the cursor changes into the appropriate icon showing I can reveal the preview pane, but when I click, hold and drag left, the preview pane won't be revealed.


I'm using a Magic Trackpad 2, and I thought it may have been a glitch with pressing/holding and dragging, but that doesn't seem to be the issue.


I've quit and restarted Mail. I've restarted my Mac.

I opened a .plist for Mail to see what I could find.


There is an entry for:

NSNavPanelExpandedStateForSaveMode and I set that to NO (was YES).

That didn't help.


There's an entry for:

NSNavPanelExpandedSizeForSaveMode and it was set to a size that appeared to be the preview pane being CLOSED. So I reset it to the same size for the is value: NSNavPanelExpandedSizeForOpenMode


But that didn't help.


Any ideas how to fix this?

Thanks.

iMac with Retina 5K display, OS X El Capitan (10.11.1)

Posted on Mar 20, 2017 2:40 PM

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Sierra Mail Preview pane stuck closed

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