January 15, 2019—KB4480976 (OS Build 17134.556)

Applies to: Windows 10, version 1803

Improvements and fixes


This update includes quality improvements. No new operating system features are being introduced in this update. Key changes include:

  • Addresses an issue in Microsoft Edge that fails to trigger the focusin event if the focus event listener of an element shifts focus to another element. 
  • Addresses an issue that prevents sharing and timeline features and roaming settings from working for accounts that use Chinese, Japanese, and Korean languages. 
  • Addresses an issue that may prevent some applications from displaying the Help (F1) window correctly. 
  • Addresses an issue that causes power options to appear on the Windows security screen when the per user group policy to hide power options is set. 
  • Addresses an issue that prevents links for certain compressed file formats from resolving.
  • Addresses an issue that causes BitLocker Network Unlock to fail on generation 2 virtual machines when it’s used in a network that only supports IPv4. 
  • Addresses a privacy issue with apps that obtain the BroadFileSystemAccess capability without a user’s consent. 
  • Addresses an issue in which WAM logging causes some applications such as Microsoft Office to stop working. 
  • Addresses an issue that causes catalog signed scripts, including those shipped as part of Windows, to incorrectly generate a Windows Defender Application Control (WDAC) failure audit event. 
  • Addresses an issue in which Windows Driver Frameworks causes high CPU utilization. As a result, the user-mode driver stops working when the device resumes from Hibernate (S4). 
  • Addresses an issue that may cause a 30-second delay when deleting or renaming a link in a Distributed File System (DFS) Namespace. Additionally, renaming a folder may take 30 seconds when multiple users work in a group share simultaneously, and File Explorer stops responding. 
  • Addresses an issue that prevents you from overwriting a file in a shared folder because of an Access Denied error when a filter driver is loaded.
  • Addresses an issue that may cause third-party applications to have difficulty authenticating hotspots. 
  • Addresses an issue that may cause a blue screen to appear when a Thunderbolt storage device is attached.
  • Addresses an issue that throws an exception when instantiating SqlConnection after you install the August Preview of Quality Rollup or September 11, 2018 .NET Framework update.
  • Addresses an issue that overwrites a user's Windows settings to display in a non-English language. This issue causes the display of Microsoft Office centennial apps to revert to the English language after installing a Microsoft Office update. 
  • Addresses an issue that causes the clock and the calendar flyout to ignore user settings for Japanese Era date and time formats. For more information, see KB4469068.
  • Addresses an issue that can overwrite gan-nen support behavior for the Japanese Era with a newer update. For more information, see KB4469068.
  • Addresses an issue that fails to recognize the first character as the abbreviation for the Japanese Era name. For more information, see KB4469068.
  • Addresses an issue that fails to display the correct Japanese Era name in Microsoft Office Visual Basic for Applications. For more information, see KB4469068.

If you installed earlier updates, only the new fixes contained in this package will be downloaded and installed on your device.

Known issues in this update


Symptom Workaround
After installing this update, some users cannot pin a web link on the Start menu or the taskbar. Microsoft is working on a resolution and will provide an update in an upcoming release.
Applications that use a Microsoft Jet database with the Microsoft Access 97 file format may fail to open if the database has column names greater than 32 characters. The database will fail to open with the error, “Unrecognized Database Format”.

This issue is resolved in KB4487017.

After installing KB4480966, some users report that they cannot load a webpage in Microsoft Edge using a local IP address. Browsing fails or the webpage may become unresponsive.

This issue is resolved in KB4487017.

After installing this update, the first character of the Japanese era name is not recognized as an abbreviation and may cause date parsing issues.

Modify the registry with the two-character abbreviation for Japanese eras as follows:

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Nls\Calendars\Japanese\Eras]

"1868 01 01"="明治__Meiji_M"

"1912 07 30"="大正__Taisho_T"

"1926 12 25"="昭和__Showa_S"

"1989 01 08"="平成__Heisei_H"

Microsoft is working on a resolution and will provide an update in an upcoming release.

How to get this update


Before installing this update

Microsoft strongly recommends you install the latest servicing stack update (SSU) for your operating system before installing the latest cumulative update (LCU). SSUs improve the reliability of the update process to mitigate potential issues while installing the LCU and applying Microsoft security fixes. For more information, see Servicing stack updates.

If you are using Windows Update, the latest SSU (KB4477137) will be offered to you automatically. To get the stand-alone package for the latest SSU, go to the Microsoft Update Catalog

Install this update

To download and install this update, go to Settings > Update & Security > Windows Update and select Check for updates.

To get the stand-alone package for this update, go to the Microsoft Update Catalog website.

File information

For a list of the files that are provided in this update, download the file information for cumulative update 4480976