Microsoft has released the Windows 10 1909 KB4580386 monthly “C” release preview cumulative update with quality improvements and fixes for Microsoft Xbox Game Pass, USB printer, and screen flashing issues.
Once KB4580386 is installed on a device running Windows 10, version 1909, the OS build will be updated to 18363.18363.1171.
More info on the types of updates released by Microsoft every month is available within the Windows 10 update servicing cadence primer.
This preview cumulative update addresses an issue preventing Microsoft Xbox Game Pass users from playing some games that they were eligible to play and fixes a reliability issue that causes the display to flash constantly.
As BleepingComputer reported yesterday, the screen flash issues were noticed by users after installing the KB4579311 cumulative update released on October 13th, 2020.
KB4580386 also fixes a known issue that causes USB printer ports to disappear after system reboots if the printer device is powered off.
Microsoft also introduces Meet Now in the Windows 10 Taskbar with the KB4580386 preview update to make it “easy to connect with anyone in as little as two clicks for free.”
“In the coming weeks, you will be able to easily set up a video call and reach friends and family in an instant by clicking the Meet Now icon in the taskbar notification area,” Microsoft added. “No sign ups or downloads needed.”
Last but not least, Microsoft says that customers who install the KB4580386 non-security update might experience issues upgrading to the latest Windows 10 versions if HTTP Internet access for LOCAL SYSTEM accounts is blocked using a firewall.
What’s changed in KB4580386
Windows 10 users can install the “2020-10 Cumulative Update Preview for Windows 10 Version 1909” via Windows Update or through the Microsoft Catalog.
Here is the full list of quality improvements and fixes delivered by the KB4580386 non-security update:
- Addresses an issue with using Group Policy Preferences to configure the homepage in Internet Explorer.
- Allows administrators to use a Group Policy to enable Save Target As for users in Microsoft Edge IE Mode.
- Addresses an issue with untrusted URL navigations from Internet Explorer 11 by opening them in Microsoft Defender Application Guard using Microsoft Edge.
- Addresses an issue that occurs when using the full suite of developer tools in Microsoft Edge for remote debugging on a Windows 10 device.
- Addresses an issue that displays a black screen to Windows Virtual Desktop (WVD) users when they attempt to sign in.
- Addresses an issue that might prevent a Microsoft Xbox Game Pass user from playing certain games that are eligible for play.
- Addresses an issue that displays nothing on the screen for five minutes or more during the Remote Desktop Protocol (RDP) session.
- Addresses a reliability issue that causes the screen to flash constantly.
- Addresses an issue with Dynamic Data Exchange (DDE) that causes a memory leak when multiple clients connect to the same server.
- Addresses an issue that causes an application to stop responding temporarily, which causes extra z-order operations that affect the Window.Topmost property of a window.
- Addresses an issue that might cause DDE apps to stop working.
- Addresses an issue that occurs when you first sign in to an account or unlock an existing user session using Remote Desktop Services (RDS). If you enter an incorrect password, the current keyboard layout changes unexpectedly to the system default keyboard layout. This keyboard layout change might cause additional attempts to sign in to fail or lead to account lockouts in domains with low account lockout thresholds.
- Addresses an issue with the CleanupProfiles Group Policy object (GPO). After you upgrade the operating system, when you configure the CleanupProfiles GPO, it fails to remove unused user profiles.
- Addresses an issue that displays the incorrect CPU frequency for certain processors.
- Addresses a performance issue that occurs when PowerShell reads the registry to check if the ScriptBlockLogging registry key is in the registry.
- Addresses an issue that randomly changes the time offset of the time format returned by the command WMIC.exe OS Get localdatetime/ value.
- Addresses an issue that prevents Microsoft User Experience Virtualization (UE-V) from assigning the Microsoft Outlook Signatures.
- Addresses an issue that prevents Hybrid Azure Active Directory joined devices from updating portal information when a device name or Windows version changes.
- Addresses an issue that causes Windows to stop working and generates error 0x17. This issue occurs when Windows Defender Device Guard is enabled and a driver is loaded with a 4K Microsoft Portable Executable (PE) header.
- Adds a new Microsoft Event Tracing for Windows (ETW) provider named “Microsoft-Antimalware-UacScan”. This ETW provider reports the details of the context for each User Account Control (UAC) request in the ETW provider manifest.
- Addresses issue that causes a USB printer port to disappear after restarting when the printer device is turned power off.
- Addresses an issue that causes stop error 0xd1 in msiscsi.sys. This issue occurs when moving certain arrays from one cluster node to another.
- Addresses an issue that prevents Windows Update and Microsoft Store from connecting to peers over virtual private networks (VPN) for downloads.
- Adds functionality that shows a preview of the features and capabilities included in an update when a new update is offered to your device. On the Windows Update page (Start > Settings > Update & Security > Windows Update), there’s an option to “See what’s in this update.”
- Adds support for the Transport Layer Security (TLS) 1.1 and 1.2 protocols when connecting to SQL Server using the data providers in Windows Defender Application Control (WDAC).
- Addresses an issue with SQL Server that might cause performance issues if you configure a Linked Server provider to load out-of-process.
- Addresses an issue that might degrade Windows performance and prevent the LanmanServer service from starting when third-party software uses LanmanServer custom file system controls (FSCTL).
- Addresses an issue with deduplication that causes long wait times on Resilient File System (ReFS) Cluster Shared Volumes (CSV).
- Addresses an issue that might prevent some applications from behaving correctly. This occurs when you publish them as Remote Application Integrated Locally (RAIL) applications using RDS and change the docking for an AppBar window.
- Addresses an issue with a deadlock in the Transmission Control Protocol/Internet Protocol (TCPIP) driver that causes the operating system to stop working or stop responding.
- Addresses an issue that causes the Routing and Remote Access Service (RRAS) to stop responding for new connections. However, RRAS continues working for existing connections.
- Addresses an issue that causes the RRAS administrator Microsoft Management Console (MMC) to stop responding randomly when you are performing administrative tasks or at startup.
- Improves the Windows Server Storage Migration Service by:
- Adding inventory validation.
- Improving retransfer performance .
- Resolving multiple issues, including reliability issues.
- Verifying that source machines have installed the current update.