On August 8, 2017, Microsoft released the latest update for Office 2016 (MSI installations; version 16.0.4549.1000). This update (KB4036121) includes a bug that causes the eXtyles Paragraph Styling palette and the Auto-Redact dialog to crash. When you click the Style Paragraphs button or the Auto-Redact button, the respective dialogs fail to load. All other eXtyles features continue to function.

The corresponding update for Office 365 and Office 2016 Click-to-Run installations (Version 1707, Build 8326.2058) was first released towards the end of July; the date of this update depends on the user's Update Channel.  In these versions of Word, only the Paragraph Styling palette is affected by the update. 


UPDATE (08-03-17): Microsoft has acknowledged this bug, and they are working on a fix. This FAQ will be updated as we continue to diagnose and resolve the problem. If you have any questions or concerns, please contact

The specific file that introduces this issue has been identified (C:\Program Files\Microsoft Office\root\vfs\SystemX86\mscomctl.ocx) and reported to the Microsoft Team. 

We recommend disabling automatic Office updates until this problem is resolved.

Workarounds for Office 365 and Click-to-run 

Workaround 1: Revert Office 365 to version 1706

If you have already installed this update, we recommend that you roll-back to the previous version of Office. To revert Office 2016 to version 1706:

1) Disable Automatic Updates so Office doesn't try to update itself again once you've completed the other steps. Open Word, then click File > Account. Next, click the Update Options button and choose Disable Updates. If you are an Office Insider, temporarily opt-out of the program.

2) Close all Office applications

3) Open the Command Terminal with Administrator privileges

4) Run the command:
"C:\Program Files\Common Files\microsoft shared\ClickToRun\officec2rclient.exe" /update user updatetoversion=16.0.xxxx.yyy
where xxx.yyyy is the build number you want installed.

We recommend rolling back to the June 28 update, version 1706, using this command:
"C:\Program Files\Common Files\microsoft shared\ClickToRun\officec2rclient.exe" /update user updatetoversion=16.0.8229.2073

The Office Update program will run and revert your Office installation to the specified build number.

Workaround 2: Replace mscomctl.ocx

If you cannot revert the Office update for whatever reason, you can safely replace the updated file mscomctl.ocx with the core version used by all other Windows applications, located in the System32 or SysWWOW64 directory. 

NOTE: This option carries some risk, but if you follow these instructions carefully, you can back out this fix. 

Based on our testing and Microsoft's release notes, we believe this change should be safe. The updated file appears to affect new accessibility features and not security. 

On 32-bit versions of Windows:

  • Copy the file C:\Program Files\Microsoft Office\root\VFS\SystemX86\mscomctl.ocx to a safe location
  • Copy the file C:\Windows\System32\mscomctl.ocx to C:\Program Files\Microsoft Office\root\VFS\SystemX86\, overwriting the newer copy of this file with the older file

On 64-bit versions of Windows

  • Copy the file C:\Program Files (x86)\Microsoft Office\root\VFS\SystemX86\mscomctl.ocx to a safe location
  • Copy the file C:\Windows\SysWOW64\mscomctl.ocx to C:\Program Files (x86)\Microsoft Office\root\VFS\SystemX86\, overwriting the newer copy of this file with the older file

Workarounds for Office 2016 MSI

Note: We have received updates from users that the following workaround may not resolve the problem for all users. We are investigating additional workarounds. Thank you for your patience!

Workaround 1: Uninstall Office 2016 update

If you have Office 2016 installed without an Office 365 subscription, you may have installed the bug in update KB4011051. We recommend that you uninstall this update through the Windows Control Panel.

  1. From the Control Panel, click "Uninstall a program" in the Programs section; then click the "View installed updates" link in the left pane to view all updates.
  2. Click the Office update that you wish to uninstall (KB4011051, or the latest update), and then click the "Uninstall" button near the top of the window.
  3. Click "Yes" to confirm the action and uninstall the Office update. Restart your computer if prompted to do so.

Is my Office Click-to-run or MSI-based?

  1. Open an Office application, such as Outlook or Word.
  2. Go to File > Account or Office Account.
  3. If you see an "Update Options" item, you have a Click-to-Run installation. If you don't see the "Update Options" item, you have an MSI-based install.

(borrowed from MS Support)