Mail preview text flickering in MacOS Sierra

Whenever I access a Mac Mail mailbox, the preview text of all the messages flickers initially, then stops. This is a new issue since upgrading to Sierra. I haven't seen this reported by anyone else, so I'm hoping it's something that can be resolved. Is anyone else seeing this, and is there a known solution?

iMac, macOS Sierra (10.12), 27" Screen

Posted on Sep 24, 2016 3:18 PM

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68 replies

Oct 19, 2016 3:19 AM in response to WGQ

Daylite Mail still installed and no flickering (yet.) What I did was go to Library/Mail/Bundles and remove the MsgFiler bundle which wasn't even active as I'm using the Application version now.


I suggest others having this issue look in their Mail Bundles folder and clear out things that aren't in use.


If the flicker comes back for me today I'll uninstall DMI and report back here.

Oct 19, 2016 8:41 PM in response to Michael_Los_Angeles

Sierra 10.12.1 is expected out soon. I expect we might see it by the Apple Event on Oct 27. It's a big update with lot of fixes. Be sure your add-ons are also updated.


The last public beta build today was big 1.25 GB. It took quite some time to download and the install time was similar to installing Sierra. After updating, I would restart a second time in Safe Boot mode then restart normally. As always, backup prior to upgrading.


If the flickering continues after the update, be sure to let Apple know via feedback.


Safe boot

* shutdown

* start the Mac and *wait* for the startup chime to sound

* after the sound, press and hold down the shift key

* keep holding and *wait* until the grey  Apple logo appears

* now release the shift key and just wait (it could take a few minutes)

* eventually the login screen appears with the words SAFE BOOT

* simply restart normally

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Mail preview text flickering in MacOS Sierra

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