Mail content black/distorted after 10.12.6 Sierra update

After installing the macOS Sierra 10.12.6 via the App Store updater, the Mail app message pane is either completely black or half black, half distorted images from Mail attachments.

I'll attach a screen shot. The list of mailboxes on the left and the inbox mail in the center column are fine, but the content in the message itself is unreadable. Double clicking on the individual message produces mixed results. If the email contains only forwarded images, the images appear with no distortion. If there is any text, even opening the individual email does not help. The only thing that does make the email text appear is clicking "reply," "reply all," or "forward." The Mail app works as expected for that message after clicking one of those three options.

Another user, patwherity, asked the ASC about a similar problem following the 10.12.5 update: “Mail headings but no content visible after upgrading to Sierra 10.12.5.” One suggested solution then was to use the full combo updater.

Here's the EtreCheck report for my newly updated (but not improved) system:

EtreCheck version: 3.4.2 (436)

Report generated 2017-07-24 14:06:55

Download EtreCheck from https://etrecheck.com

Runtime: 2:02

Performance: Excellent

Click the [Lookup] links for more information from Apple Support Communities.

Click the [Details] links for more information about that line.

Problem: Other problem

Description:

After installing the macOS Sierra 10.12.6 via the App Store updater, the Mail app message pane is either completely black or half black, half distorted images from Mail attachments. Another user, patwherity, asked the ASC about a similar problem following the 10.12.5 update: “Mail headings but no content visible after upgrading to Sierra 10.12.5.” One suggested solution was to use the full combo updater.

Hardware Information: ⓘ

MacBook Pro (Retina, Mid 2012)

[Technical Specifications] - [User Guide] - [Warranty & Service]

MacBook Pro - model: MacBookPro10,1

1 2.7 GHz Intel Core i7 (i7-3820QM) CPU: 4-core

16 GB RAM Not upgradeable

BANK 0/DIMM0

8 GB DDR3 1600 MHz ok

BANK 1/DIMM0

8 GB DDR3 1600 MHz ok

Bluetooth: Good - Handoff/Airdrop2 supported

Wireless: en0: 802.11 a/b/g/n

Battery: Health = Check Battery - Cycle count = 485

Video Information: ⓘ

Intel HD Graphics 4000 - VRAM: 1536 MB

NVIDIA GeForce GT 650M - VRAM: 1024 MB

Color LCD 2880 x 1800

SyncMaster 1440 x 900 @ 60 Hz

Disk Information: ⓘ

APPLE SSD SM768E disk0: (751.28 GB) (Solid State - TRIM: Yes)

[Show SMART report]

EFI (disk0s1 - MS-DOS FAT32) <not mounted> [EFI]: 210 MB

[redacted] (disk0s2 - Journaled HFS+) / [Startup]: 695.00 GB (128.89 GB free)

Recovery HD (disk0s3 - Journaled HFS+) <not mounted> [Recovery]: 650 MB

Boot Camp (disk0s4 - NTFS) /Volumes/Boot Camp : 55.42 GB (16.83 GB free)

USB Information: ⓘ

USB20Bus

hub_device

Apple Inc. FaceTime HD Camera (Built-in)

USB20Bus

hub_device

hub_device

Apple Inc. Apple Internal Keyboard / Trackpad

Apple Inc. BRCM20702 Hub

Apple Inc. Bluetooth USB Host Controller

USB30Bus

Burr-Brown from TI USB audio CODEC

hub_device

USB30Bus

DisplayLink BVU195

Thunderbolt Information: ⓘ

Apple Inc. thunderbolt_bus

Belkin International, Inc. Thunderbolt 2 Express Dock HD

Apple Inc. Thunderbolt to FireWire Adapter

System Software: ⓘ

macOS Sierra 10.12.6 (16G29) - Time since boot: about one hour

Configuration files: ⓘ

/etc/hosts - Count: 1

Gatekeeper: ⓘ

Anywhere [Fix Gatekeeper security]

Kernel Extensions: ⓘ

/Applications/DiskWarrior.app

[not loaded] com.alsoft.Preview (5.0 - SDK 10.5) [Lookup]

/Applications/Kies.app

[not loaded] com.devguru.driver.SamsungACMControl (1.4.32 - SDK 10.6) [Lookup]

[not loaded] com.devguru.driver.SamsungACMData (1.4.32 - SDK 10.6) [Lookup]

[not loaded] com.devguru.driver.SamsungComposite (1.4.32 - SDK 10.6) [Lookup]

[not loaded] com.devguru.driver.SamsungMTP (1.4.32 - SDK 10.5) [Lookup]

[not loaded] com.devguru.driver.SamsungSerial (1.4.32 - SDK 10.6) [Lookup]

/Applications/Parallels Desktop.app

[not loaded] com.parallels.kext.hidhook (8.0 18619.1001606) [Lookup]

[not loaded] com.parallels.kext.hypervisor (8.0 18619.1001606) [Lookup]

[not loaded] com.parallels.kext.netbridge (8.0 18619.1001606) [Lookup]

[not loaded] com.parallels.kext.usbconnect (8.0 18619.1001606) [Lookup]

[not loaded] com.parallels.kext.vnic (8.0 18619.1001606) [Lookup]

/Applications/Toast 10 Titanium/Toast Titanium.app

[not loaded] com.roxio.BluRaySupport (1.1.6) [Lookup]

/Applications/Wondershare AllMyTube.app

[loaded] com.Perfect.Driver.SystemAudioRecorder (1.1.0 - SDK 10.6) [Lookup]

/Library/Extensions

[not loaded] com.displaylink.dlusbncm (1.11.0 - SDK 10.9) [Lookup]

[loaded] com.displaylink.driver.DisplayLinkDriver (2.2 (55481) - SDK 10.9) [Lookup]

[loaded] com.techsmith.TACC (1.0.3 - SDK 10.10) [Lookup]

/System/Library/Extensions

[not loaded] com.makemkv.kext.daspi (1.4) [Lookup]

~/Library/Services/ToastIt.service/Contents/MacOS

[not loaded] com.roxio.TDIXController (2.0) [Lookup]

System Launch Agents: ⓘ

[not loaded] 7 Apple tasks

[loaded] 174 Apple tasks

[running] 101 Apple tasks

System Launch Daemons: ⓘ

[not loaded] 40 Apple tasks

[loaded] 173 Apple tasks

[running] 104 Apple tasks

Launch Agents: ⓘ

[failed] com.adobe.ARMDCHelper.cc24aef4a1b90ed56a725c38014c95072f92651fb65e1bf9c8e43c37a2 3d420d.plist (Adobe Systems, Inc. - installed 2017-05-09) [Lookup]

[not loaded] com.displaylink.useragent-prelogin.plist (? 16b36862 5a8ec523 - installed 2014-07-08) [Lookup]

[running] com.displaylink.useragent.plist (? 34525a17 5a8ec523 - installed 2014-07-08) [Lookup]

[loaded] com.divx.dms.agent.plist (? bf9bdaf7 afe1ef24 - installed 2017-06-15) [Lookup]

[loaded] com.divx.uninstall.converter.plist (Shell Script 9e90dee7 - installed 2017-05-23)

[loaded] com.divx.uninstall.player.plist (Shell Script 664f994d - installed 2017-05-23)

[loaded] com.divx.uninstall.preferences.plist (Shell Script 1cd1d81c - installed 2017-05-23)

[loaded] com.divx.update.agent.plist (DivX, LLC - installed 2017-06-15) [Lookup]

[loaded] com.google.keystone.agent.plist (Google, Inc. - installed 2017-06-04) [Lookup]

[loaded] com.oracle.java.Java-Updater.plist (? d06fcb0 be93c7fb - installed 2017-06-05) [Lookup]

[loaded] org.macosforge.xquartz.startx.plist (Apple Inc. - XQuartz - installed 2014-05-17) [Lookup]

Launch Daemons: ⓘ

[loaded] com.adobe.ARMDC.Communicator.plist (Adobe Systems, Inc. - installed 2017-05-09) [Lookup]

[loaded] com.adobe.ARMDC.SMJobBlessHelper.plist (Adobe Systems, Inc. - installed 2017-05-09) [Lookup]

[loaded] com.barebones.authd.plist (Bare Bones Software, Inc. - installed 2013-02-15) [Lookup]

[running] com.displaylink.displaylinkmanager.plist (DisplayLink Corp - installed 2014-07-08) [Lookup]

[loaded] com.google.keystone.daemon.plist (Google, Inc. - installed 2017-06-04) [Lookup]

[loaded] com.marketcircle.daylite.accessd.plist (Marketcircle Inc - installed 2016-11-28) [Lookup]

[loaded] com.marketcircle.daylite.attachmentd.plist (Marketcircle Inc - installed 2016-11-28) [Lookup]

[loaded] com.marketcircle.daylite.backupd.plist (Marketcircle Inc - installed 2016-11-28) [Lookup]

[running] com.marketcircle.daylite.cardcald.plist (Marketcircle Inc - installed 2016-11-28) [Lookup]

[running] com.marketcircle.daylite.portsd.plist (Marketcircle Inc - installed 2016-11-28) [Lookup]

[loaded] com.marketcircle.daylite.staged.plist (Marketcircle Inc - installed 2016-11-28) [Lookup]

[loaded] com.marketcircle.daylite.touchd.plist (Marketcircle Inc - installed 2016-11-28) [Lookup]

[loaded] com.microsoft.autoupdate.helper.plist (Microsoft Corporation - installed 2017-07-11) [Lookup]

[loaded] com.microsoft.office.licensing.helper.plist (? 6d8cb30e 8b29c3ef - installed 2012-04-02) [Lookup]

[loaded] com.microsoft.office.licensingV2.helper.plist (Microsoft Corporation - installed 2017-06-10) [Lookup]

[loaded] com.oracle.java.Helper-Tool.plist (Shell Script e3fefdd2 - installed 2017-03-15) [Lookup]

[loaded] com.rogueamoeba.instanton-agent.plist (Rogue Amoeba Software, LLC - installed 2014-09-19) [Lookup]

[loaded] net.sourceforge.MonolingualHelper.plist (ti und m AG - installed 2013-01-23) [Lookup]

[loaded] org.macosforge.xquartz.privileged_startx.plist (Apple Inc. - XQuartz - installed 2014-05-17) [Lookup]

User Launch Agents: ⓘ

[running] com.amazon.music.plist (? 7c73c27a 9c4747c3 - installed 2015-10-19) [Lookup]

[loaded] com.citrixonline.GoToMeeting.G2MUpdate.plist (Citrix Online LLC - installed 2017-05-22) [Lookup]

[loaded] com.dropbox.DropboxMacUpdate.agent.plist (Dropbox, Inc. - installed 2017-07-13) [Lookup]

[failed] com.wondershare.mobilegodaemon.plist (? 8e21de98 0 - installed 2017-06-25) [Lookup]

[not loaded] info.lokiware.attachmenttamer.cleanup.plist (Shell Script 52e15873 - installed 2017-04-28)

[running] ws.agile.1PasswordAgent.plist (? 4b2acad6 dbc058f8 - installed 2017-06-03) [Lookup]

User Login Items: ⓘ

Flux Application

(/Applications/Flux.app)

gfxCardStatus Application

(~/Downloads/gfxCardStatus.app)

iTunesHelper Application (Apple, Inc. - installed 2017-07-24)

(/Applications/iTunes.app/Contents/MacOS/iTunesHelper.app)

VLCStreamer Application

(/Applications/VLCStreamer.app)

Canon IJ Network Scanner Selector EX Application

(/Applications/Canon Utilities/IJ Network Scanner Selector EX/Canon IJ Network Scanner Selector EX.app)

Rogue Amoeba Schedule Helper Application - Hidden

(/Library/Application Support/Audio Hijack Pro/Rogue Amoeba Schedule Helper.app)

Android File Transfer Agent Application

(~/Library/Application Support/Google/Android File Transfer/Android File Transfer Agent.app)

Dropbox Application

(/Applications/Dropbox.app)

DiskWarriorStarter Application

(/Applications/DiskWarrior.app/Contents/Helpers/DiskWarriorStarter.app)

MacLWSLauncher Application (? 0 - installed 2017-02-05)

(/Applications/Logitech/LWS/Logitech Webcam Software.app/Contents/MacOS/MacLWSLauncher.app)

Wondershare Helper Compact Application

(~/Library/Application Support/Helper/Wondershare Helper Compact.app)

EvernoteHelper Application (Evernote - installed 2015-02-06)

(/Applications/Evernote.app/Contents/Library/LoginItems/EvernoteHelper.app)

KiesAgent Application - Hidden (? 0 - installed 2017-06-25)

(/Applications/Kies.app/Contents/MacOS/KiesAgent.app)

fuspredownloader Application - Hidden

(~/Library/Application Support/.FUS/fuspredownloader.app)

Printer Pro Desktop Application

(/Applications/Printer Pro Desktop.app)

Internet Plug-ins: ⓘ

Flip4Mac WMV Plugin: 3.3.6.2 (installed 2015-07-31) [Lookup]

npDDRia: 0.0.14.3 (installed 2015-02-05) [Lookup]

QuickTime Plugin: 7.7.3 (installed 2017-07-24)

AdobePDFViewerNPAPI: 17.009.20058 (installed 2017-07-14) [Lookup]

AdobePDFViewer: 17.009.20058 (installed 2017-07-14) [Lookup]

DivX Web Player: 3.8.3.423 (installed 2017-05-23) [Lookup]

Silverlight: 5.1.40728.0 (installed 2015-09-13) [Lookup]

SharePointBrowserPlugin: 14.7.0 (installed 2016-12-01) [Lookup]

CloudOn: CloudOn 2.0.35 (installed 2013-09-23) [Lookup]

DirectorShockwave: 11.6.8r638 (installed 2012-12-12) [Lookup]

JavaAppletPlugin: Java 8 Update 131 build 11 (installed 2017-06-05) Check version

User internet Plug-ins: ⓘ

CitrixOnlineWebDeploymentPlugin: 1.0.105 (installed 2014-05-08) [Lookup]

EMusic: EMusic 1.0.0 (installed 2014-06-18) [Lookup]

WebEx64: 1.0 (installed 2013-09-27) [Lookup]

Safari Extensions: ⓘ

[disabled] DuckDuckGo - DuckDuckGo - http://duckduckgo.com (installed 2017-06-01)

[enabled] AllMyTube - Wondershare - http://www.wondershare.com (installed 2015-09-14)

[not loaded] Open in Internet Explorer - Parallels - http://www.parallels.com (installed 2015-01-21)

[disabled] StartPage HTTPS - Surfboard B.V. - https://startpage.com (installed 2016-11-15)

[enabled] Blur - Abine, the online privacy company. - https://www.abine.com (installed 2017-06-05)

[disabled] Clip to DEVONthink - DEVONtechnologies - http://www.devontechnologies.com/redirect.php?id=download-extras (installed 2016-02-04)

[enabled] Adblock Plus - Eyeo GmbH - https://adblockplus.org/ (installed 2017-06-05)

[enabled] Enpass Password Manager - Sinew Software Systems - https://enpass.io/ (installed 2017-06-03)

[enabled] 1Password - AgileBits - https://agilebits.com/onepassword (installed 2017-06-09)

3rd Party Preference Panes: ⓘ

Flip4Mac WMV (installed 2015-07-31) [Lookup]

Java (installed 2017-06-05) [Lookup]

Paragon NTFS for Mac ® OS X (installed 2013-01-23) [Lookup]

VLC Streamer (installed 2012-07-04) [Lookup]

Time Machine: ⓘ

Mobile backups: ON

Auto backup: YES

Volumes being backed up:

North Star: Disk size: 695.00 GB Disk used: 566.11 GB

Destinations:

Time Machine Seagate 4TB [Local]

Total size: 4.00 TB

Total number of backups: 69

Oldest backup: 11/27/16, 6:12 PM

Last backup: 7/17/17, 2:28 PM

Size of backup disk: Excellent

Backup size 4.00 TB > (Disk size 695.00 GB X 3)

Top Processes by CPU: ⓘ

23% WindowServer

1% kernel_task

0% fontd

0% mdworker

0% mdworker

Top Processes by Memory: ⓘ

3.16 GB kernel_task

885 MB com.apple.WebKit.WebContent

875 MB com.apple.WebKit.WebContent

756 MB Mail

686 MB Safari

Top Processes by Network Use: ⓘ

Input Output Process name

21 MB 87 KB Mail

418 KB 2 MB Dropbox

79 KB 49 KB mDNSResponder

10 KB 7 KB apsd

10 KB 6 KB Safari

Top Processes by Energy Use: ⓘ

45.66 WindowServer

2.82 mdworker

2.70 mdworker

2.50 com.apple.WebKit.WebContent

Virtual Memory Information: ⓘ

2.25 GB Available RAM

21 MB Free RAM

13.75 GB Used RAM

2.23 GB Cached files

0 B Swap Used

Software installs: ⓘ

Ghostscript-9.21: (installed 2017-06-26)

Microsoft Office 2016 for Mac: (installed 2017-07-11)

Adobe Acrobat Reader DC (17.009.20058): (installed 2017-07-14)

Install information may not be complete.

Diagnostics Information: ⓘ

2017-07-24 12:54:22 Evernote.app Crash [Open]

Cause: objc_msgSend() selector name: isEqual:

2017-07-24 11:50:53 Mail.app High CPU use [Open] [Details]