Alongside the out-of-band update for the two most recent releases of the operating system, Microsoft is also making available the update KB4586819 as a preview for computers running Windows 10 version 1909 and 1903. This is a “C” update since it became available during the third week of the month, and it’s optional and contains a slew of non-security fixes that are planned to rollout during the next Patch Tuesday release.

KB4586819 bumps the version number to build 18362.1237 and 18363.1237 for version 1909 and 1903 respectively, and according to the changelog, fixes opening Microsoft Edge in the background issue, problems with USB 3.0 hubs, issue with spatial audio stopping on games, and address quality issues of Windows Mixed Reality headsets.

In addition to the update KB4586819, the software giant is also releasing previews of the quality fixes and improvements coming for version 1809.

  • Update KB4586819 for Windows 10 version 1909 and 1903
  • Update KB4586839 for Windows 10 version 1809

Update KB4586819 for Windows 10 version 1909 and 1903

Microsoft has announced KB4586819 in the Windows support site, and if you already have the November 2019 Update or May 2019 Update, it’ll fix a slew of problems, some of which include:

  • Fixes a problem that causes the Chromium-based Microsoft Edge browser to open in the background when a device is in tablet mode.
  • Fixes a problem that displays a black screen to Windows Virtual Desktop (WVD) users when they attempt to sign in.
  • Addresses an issue with USB 3.0 hubs. A device connected to the hub might stop working when you set the device to hibernate or restart the device.
  • Fixes a problem that might cause games that use spatial audio to stop working.
  • Addresses an issue with leaking Graphics Device Interface (GDI) Font Handles that result in unexpected behaviors in certain applications.
  • Fixes a problem with missing enforced groups in the Start menu layout, which occurs when using mobile device management (MDM) to set the tile groups.
  • Addresses an issue that fails to set the desktop wallpaper as configured by a Group Policy object (GPO) when you specify the local background as a solid color.
  • Fixes a problem with the Search bar in Shell namespace extension products, which causes File Explorer to stop working unexpectedly.
  • Addresses an issue that might prevent user settings from syncing across devices.
  • Fixes a problem that causes the “I forgot my Pin” functionality on the lock screen to fail.
  • Addresses an issue that causes a system to stop working during startup.
  • Improves the visual quality of Windows Mixed Reality headsets that run in lower resolution mode.

You can download the updates to install them manually for version 20H2 or 2004 from the Microsoft Update Catalog website.

Update KB4586839 for Windows 10 version 1809

Microsoft has also announced KB4586839 in the Windows support site, and it’s referred as “November 19, 2020—KB4586839 (OS Build 17763.1613) Preview.” If you’re already running the Windows 10 October 2018 Update on your device, this update fixes a bunch of problems, some of which include:

  • Fixes a problem that causes the Chromium-based Microsoft Edge browser to open in the background when a device is in tablet mode.
  • Addresses an issue with USB 3.0 hubs. A device connected to the hub might stop working when you set the device to hibernate or restart the device.
  • Fixes a problem that causes the hard drive to fill up in certain error situations.
  • Addresses an issue that causes the “I forgot my Pin” functionality on the lock screen to fail.
  • Fixes a problem that causes a system to stop working during startup.
  • Addresses high memory and CPU utilization in Microsoft Defender for Endpoint.
  • Addresses an issue that might cause Dynamic Host Configuration Protocol (DHCP) servers to ignore Link Selection information (DHCP Option 82, sub-option 5) in DHCP Request packets from clients.
  • Fixes a problem that might cause a non-paged pool memory leak in a Remote Desktop Protocol (RDP) over virtual private network (VPN) scenario.
  • Addresses an issue that might cause a memory leak in bindflt.sys when copying files in a container scenario.

If you’re running version 1809, you can download and install this update from the Microsoft Update Catalog website.