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Update known issues: what changed on October 21, 2026

October 21, 2026 · Senserva Patch Tracker

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What Microsoft changed in update known issues, October 21, 2026

Each day we read the Known issues section of Microsoft's support article for every recent Windows and Office update and record what changed. Since our last post, Microsoft changed that section on 9 updates. Every quote below is Microsoft's own text, from the article linked beside it.

New known issues

"Citrix"

Microsoft added this known issue for:

Read the full text in Microsoft's article.

"Applies to"

Microsoft added this known issue for:

Read the full text in Microsoft's article.

Known issues Microsoft updated

"Noto fonts issue"

Microsoft changed the text of this known issue for:

The new text, in Microsoft's words:

There are reports of blurry or unclear CJK (Chinese, Japanese, Korean) text when displayed at 96 DPI (100% scaling) in Chromium-based browsers such as Microsoft Edge and Google Chrome. The March 2025 Preview Update introduced Noto fonts in collaboration with Google, for CJK languages as fallbacks to improve text rendering when websites or apps don’t specify appropriate fonts. The issue is due to limited pixel density at 96 DPI, which can reduce the clarity and alignment of CJK characters. Increasing the display scaling improves clarity by enhancing text rendering. Microsoft has shared its findings on the blurry text issue at 96 DPI, along with potential solutions with Google for further discussion. For additional support, users can report issues related to Noto CJK fonts through the official Google Noto Fonts GitHub repository .

"System Guard Runtime Monitor Broker service"

Microsoft changed the text of this known issue for:

The new text, in Microsoft's words:

For this reason, please do not attempt to manually uninstall or remove this service or its components. This issue is addressed in KB5055612 .

"|"

Microsoft changed the text of this known issue for:

The new text, in Microsoft's words:

A few scenarios where they are used are home audio systems, professional music studios and portable music players. Resulting from this issue, the Device Manager might display the error ‘This device cannot start. (Code 10) Insufficient system resources exist to complete the API’. | This issue is addressed in KB5050094 . | After installing this security update, you might experience issues with USB cameras. Your device might not recognize the camera is on. | This issue is addressed in KB5050094 .

"Active Directory Group Policy: Events in local policy"

Microsoft changed the text of this known issue for:

The new text, in Microsoft's words:

As always, we recommend you install the latest update for your device as it contains important improvements and issue resolutions, including this one. If you install an update released on or after April 11, 2025, you do not need to use a workaround for this issue. If you are using an update released before April 11, 2025, and are experiencing this issue, there are adjustments that can be made to the Windows registry to prevent this issue. For information, see " Security auditing settings are not applied to Windows Vista-based and Window Server 2008-based computers when you deploy a domain-based policy ".

"Microsoft Copilot"

Microsoft changed the text of this known issue for:

The new text, in Microsoft's words:

Applies to: All Users. We're aware of an issue with the Microsoft Copilot app affecting some devices. The app is unintentionally uninstalled and unpinned from the taskbar. Note: This issue has not been observed with the Microsoft 365 Copilot app. This issue has been fixed, and the affected devices are being returned to their original state. You can also reinstall the app from the Microsoft Store and pin it to the taskbar.

"USB Printer Issue"

Microsoft changed the text of this known issue for:

The new text, in Microsoft's words:

Applies to: Enterprise users After installing this update, you might observe issues with USB connected dual-mode printers that support both USB Print and IPP Over USB protocols. You might observe that the printer unexpectedly prints random text and data, including network commands and unusual characters. Resulting from this issue, the printed text might often start with the header "POST /ipp/print HTTP/1.1", followed by other IPP (Internet Printing Protocol) related headers. This issue tends to occur more often when the printer is either powered on or reconnected to the device after being disconnected. This issue is addressed in KB5053643 .

"Windows 11, versions 24H2 might not download via Windows Server Updates Services"

Microsoft changed the text of this known issue for:

The new text, in Microsoft's words:

WSUS allows Servers with the WSUS role to defer, selectively approve, and schedule updates for specific devices or groups across an organization. As part of this issue, the download of Windows 11, version 24H2, doesn't initiate or complete. Windows updates log can show error code 0x80240069, and further logs might include text similar to "Service has unexpectedly stopped". Home users are unlikely to experience this issue, as WSUS is designed for use across business and enterprise environments. This is addressed in KB5058405 . If you have an enterprise-managed device and have installed the update released May 13, 2025, KB5058405 , or later, you do not need to use a Known Issue Rollback (KIR) or a special Group Policy to resolve this issue. If you are using an update released before May 13, 2025, and have this issue, your IT admin can resolve it by installing and configuring the special Group Policy. Group Policy downloads with Group Policy name The special Group Policy can be found in Computer Configuration > Administrative Templates > < Group Policy name >. For information on deploying and configuring these special Group Policy, see How to use Group Policy to deploy a Known Issue Rollback .

"Windows Hello"

Microsoft changed the text of this known issue for:

The new text, in Microsoft's words:

If you're unable to sign in using Windows Hello facial recognition in low light or with a covered camera lens after installing this update, this is a design change for enhanced security. See the Highlights section for details.

No longer listed as known issues

"Active Directory Group Policy: Events in local policy"

Microsoft no longer lists this issue under Known issues for:

"Blue screen exception"

Microsoft no longer lists this issue under Known issues for:

"Noto fonts issue"

Microsoft no longer lists this issue under Known issues for:

"Remote Desktop"

Microsoft no longer lists this issue under Known issues for:

"System Guard Runtime Monitor Broker service"

Microsoft no longer lists this issue under Known issues for:

"System Gurad Runtime Monitor Broker service"

Microsoft no longer lists this issue under Known issues for:

"Windows Hello"

Microsoft no longer lists this issue under Known issues for:

Every recent update and its known issues are on our Microsoft patch tracker.

Compiled automatically by the Senserva Patch Tracker from Microsoft's support articles. No AI writes this post: every quote is copied from the article it links, and an issue counts as changed only when Microsoft's text changed. Sources and their terms are on our Data sources & thanks page. Facts as of 2026-10-21.

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