Windows 10 KB4601380 Update Fixes Screen Rendering Issues

Microsoft has released the KB4601380 non-security update for all editions of Windows 10, version 1909, and Windows 10, version 1809, with fixes for screen rendering and Microsoft Defender for Endpoint high resource usage issues.

After installing this preview cumulative update you may experience issues with system and user certificates getting lost if updating with outdated update media from Windows 10 1809 or later versions.

“The preview update for Windows 10, version 20H2 and Windows 10, version 2004 will be available in the near term,” Microsoft added in a Windows Message Center update.

More info regarding the types of updates released by Microsoft each month can be found in the Windows 10 update servicing cadence primer.

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KB4601380 update highlights

With the KB4601380 monthly “C” release preview update, Microsoft addresses an issue that leads to screen rendering problems when launching games on systems with certain hardware configurations.

This cumulative update also fixes a bug causing high CPU and memory usage on systems running Microsoft Defender for Endpoint (previously known as Microsoft Defender Advanced Threat Protection).

Other highlights included in this update:

• Addresses an issue with a stop error that occurs at startup.
• Updates an issue that sometimes prevents the input of strings into the Input Method Editor (IME). 
• Updates an issue that renders fonts incorrectly. 
• Addresses an issue with failover in an environment that only has IPv6 clusters. If the failover cluster has been running for more than 24 days, attempts to do a failover might not succeed or might be delayed.

What’s changed in KB4601380

KB4601380 is considered optional given that it is a Windows preview update and it will not be installed automatically.

To deploy it manually, you have to go to Settings > Update & Security > Windows Update and ‘Check for updates.’ You’ll then be able to download and install the update by going to the ‘Optional updates available’ area.

The update can also be downloaded manually from the Microsoft Catalog. After installing it, Windows 10, version 1909 will be updated to build 18363.1411.

Microsoft advises users to install the latest servicing stack update (SSU) before this cumulative update is deployed to minimize updating issues.

If you are using Windows Update, the latest SSU KB4601395 will be installed for you automatically.

Here is the full list of key quality improvements and fixes delivered by KB4601380:

• Updates the default values for the following Internet Explorer registry keys (in addition, these values will no longer be updated automatically):
  • svcKBFWLink = “ ” (empty string)
  • svcKBNumber = “ ” (empty string)
  • svcUpdateVersion = 11.0.1000.
• Addresses an issue with a memory leak in Internet Explorer 11 that occurs when you use the Chinese language pack.
• Addresses an issue with certain COM+ callout policies that cause a deadlock in certain applications.
• Addresses an issue that renders fonts incorrectly.
• Addresses an issue that sometimes prevents the input of strings into the Input Method Editor (IME).
• Addresses an issue with the SetWindowRgn API. It incorrectly sets the window region’s coordinates relative to the client area instead of relative to the upper-left corner of the window. As a result, users cannot maximize, minimize, or close a window.
• Addresses an issue with a stop error that occurs at startup.
• Removes the history of previously used pictures from a user account profile.
• Addresses an issue that might delay a Windows Hello for Business (WHfB) Certificate Trust deployment when you open the Settings-> Accounts-> Sign-in Options page.
• Addresses an issue that causes the host process of Windows Remote Management (WinRM) to stop working when it formats messages from a PowerShell plugin.
• Addresses an issue in the Windows Management Instrumentation (WMI) service that causes a heap leak each time security settings are applied to WMI namespace permissions.
• Addresses an issue with screen rendering after opening games with certain hardware configurations.
• Improves startup times for applications that have roaming settings when User Experience Virtualization (UE-V) is turned on.
• Addresses an issue that prevents the Trusted Platform Module (TPM) from starting. As a result, TPM-based scenarios do not work.
• Addresses an issue in which a principal in a trusted MIT realm fails to obtain a Kerberos service ticket from Active Directory domain controllers (DC). This occurs on devices that installed Windows Updates that contain CVE-2020-17049 protections and configured PerfromTicketSignature to 1 or higher. These updates were released between November 10, 2020 and December 8, 2020. Ticket acquisition also fails with the error, “KRB_GENERIC_ERROR”, if callers submit a PAC-less Ticket Granting Ticket (TGT) as an evidence ticket without providing the USER_NO_AUTH_DATA_REQUIRED flag.
• Addresses high memory and CPU utilization in Microsoft Defender for Endpoint.
• Enhances data loss prevention and insider risk management solution functionalities in Microsoft 365 endpoints.
• Addresses an issue with the x86 version of Microsoft Excel 365 Version 2011. It fails to open if you enable the SimExec feature of Defender Exploit Protection or stops working if you disable the SimExec exploit protection and enable the CallerCheck protection.
• Addresses an issue that displays an error when you attempt to open an untrusted webpage using Microsoft Edge or open an untrusted Microsoft Office document. The error is, “WDAG Report – Container: Error: 0x80070003, Ext error: 0x00000001”. This issue occurs after installing the .NET update KB4565627.
• Addresses an issue that prevents wevtutil from parsing an XML file.
• Addresses an issue that fails to report an error when the Elliptic Curve Digital Signature Algorithm (ECDSA) generates invalid keys of 163 bytes instead of 165 bytes.
• Adds support for using the new Chromium-based Microsoft Edge as the assigned access single kiosk app. Now, you can also customize a breakout key sequence for single app kiosks. For more information, see Configure Microsoft Edge kiosk mode.
• Addresses an issue with User Datagram Protocol (UDP) broadcast packets that are larger than the maximum transmission unit (MTU). Devices that receive these packets discard them because the checksum is not valid.
• Addresses an issue in which the WinHTTP AutoProxy service does not comply with the value set for the maximum Time To Live (TTL) on the Proxy Auto-Configuration (PAC) file. This prevents the cached file from updating dynamically.
• Improves the ability of the WinHTTP Web Proxy Auto-Discovery Service to ignore invalid Web Proxy Auto-Discovery Protocol (WPAD) URLs that the Dynamic Host Configuration Protocol (DHCP) server returns.
• Addresses an issue that might cause the IKEEXT service to stop working intermittently.
• Addresses an issue with updating to Windows Server 2019 using a .iso image. If you renamed the default administrator account, the Local Security Authority (LSA) process might stop working.
• Addresses an issue that might cause stop error 7E in nfssvr.sys on servers running the Network File System (NFS) service.
• Addresses an issue that prevents the User Profile Service from detecting a slow or a fast link reliably.
• Addresses an issue that causes contention for a metadata lock when using Work Folders.
• Addresses an issue that causes a Work Folder sync to fail with the error code 0x8007017c if you have turned on On-Demand File Access.
• Updates the Open Mobile Alliance (OMA) Device Management (DM) sync protocol by adding a check-in reason for requests from the client to the server. The check-in reason will allow the mobile device management (MDM) service to make better decisions about sync sessions. With this change, the OMA-DM service must negotiate a protocol version of 4.0 with the Windows OMA-DM client. 
• Addresses an issue with failover in an environment that only has IPv6 clusters. If the failover cluster has been running for more than 24 days, attempts to do a failover might not succeed or might be delayed.
• Adds a new dfslogkey as described below:
  • Keypath: HKEY_LOCAL_MACHINE/SOFTWARE/MICROSOFT/dfslog.
  • The RootShareAcquireSuccessEvent field has the following possible values:
    • Default value = 1; enables the log.
    • Value other than 1; disables the log.

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