Microsoft has released Windows 10 optional update KB5005103 (Build 18363.1766) for version 1909 and version 1809. The update fixes many issues including performance, OneDrive, BSOD and many other issues. This update will be the last C release update for Windows 10 version 1909.
IMPORTANT: Starting in October 2021, there will no longer be optional, non-security releases (known as “C” releases) for Windows 10, version 1909. Only cumulative monthly security updates (known as the “B” or Update Tuesday release) will continue for Windows 10, version 1909.
Microsoft has also promised to release this update for other Windows 10 versions 21H1, 20H2, and 2004 soon.
The August 2021 monthly “C” release preview updates are now available for Windows 10, version 1909 and Windows 10, version 1809. The preview update for Windows 10, version 21H1, Windows 10, version 20H2, and Windows 10, version 2004 will be available in the near term.
Check the changelog provided by Microsoft below. You can download this update for manual installation by clicking here.
- Updates an issue that prevents the Windows Movies and TV app from playing some videos (.mp4 files).
- Updates an issue that resets syncing for Microsoft OneDrive to “Known folders only” after you install a Windows update.
Improvements and fixes
This non-security update includes quality improvements. Key changes include:
- Addresses an issue that prevents users from tracking Distributed Component Object Model (DCOM) activation failures.
- Addresses a threading issue that might cause the Windows Remote Management (WinRM) service to stop working when it is under a high load.
- Addresses an issue that causes the Windows Management Instrumentation (WMI) provider host process to stop working. This occurs because of an unhandled access violation that occurs when using the Desired State Configuration (DSC).
- Addresses an issue that causes file migration between Distributed File System (DFS) paths that are stored on different volumes to fail. This issue occurs when you implement the migration using PowerShell scripts that use the Move-Item command.
- Addresses an issue that prevents you from writing to a WMI repository after a low memory condition occurs.
- Addresses an issue that might prevent you from minimizing an application that uses unthemed windows.
- Addresses an issue that prevents the Windows Movies and TV app from playing .mp4 media files that contain Pixel Aspect Ration (PAR) information.
- Addresses an issue that causes Authentication Mechanism Assurance (AMA) to stop working. This issue occurs when you migrate to Windows Server 2016 (or newer versions of Windows) and when using AMA in conjunction with certificates from Windows Hello for Business.
- Addresses an issue that prevents Secure Launch from working on some devices.
- Addresses an issue that prevents Code Integrity rules from working correctly when specifying Package Family Name rules in a Code Integrity policy. This issue occurs because of the incorrect handling of case-sensitive names.
- Addresses an issue that prevents the ShellHWDetection service from starting on a Privileged Access Workstation (PAW) device and prevents you from managing BitLocker drive encryption.
- Addresses an issue in Windows Defender Exploit Protection that prevents some Microsoft Office applications from working on machines that have certain processors.
- Addresses an issue that causes the Input Method Editor (IME) toolbar to appear even when the Remote App is closed.
- Addresses an issue with a critical exception that the Open File dialog fails to handle. As a result, a Microsoft Foundation Class (MFC) application unexpectedly closes.
- Addresses an issue that might occur when you configure the policy, “Delete user profiles older than a specified number of days on system restart”. If a user has been signed in for longer than the time specified in the policy, the device might unexpectedly delete profiles at startup.
- Addresses an issue with the Microsoft OneDrive sync setting “Always keep on this device”. The setting is unexpectedly reset to “Known folders only” after you install a Windows update.
- Addresses an issue that might create duplicate built-in local accounts, such as administrator or guest account, during an in-place upgrade. This issue occurs if you previously renamed those accounts. As a result, the Local Users and Groups MMC snap-in (lusrmgr.msc) appears blank with no accounts after the upgrade. This update removes the duplicate accounts from the local Security Account Manager (SAM) database on the affected machines. If the system detected and removed duplicate accounts, it logs a Directory-Services-SAM event, with ID 16986, in the System event log.
- Increases the default number of entries in the local security authority (LSA) Lookup Cache to improve lookup performance in high lookup volume scenarios.
- Addresses stop error 0x1E in srv2!Smb2CheckAndInvalidateCCFFile.
- Addresses an issue that might cause a system to stop working after a deduplication filter detects damage in a reparse point. This issue occurs because of deduplication driver changes introduced in a previous update.
- Addresses an issue with using the robocopy command with the backup option (/B) to fix data loss. This issue occurs when the source location contains tiered Azure File Sync files or tiered Cloud Files.
- Stops running queries against OneSettings APIs from the obsolete Storage Health feature.