TechClassy

Local evidence reader

Windows Known Issue Checker

Enter a Windows version/build, installed KB, and exact symptom to compare them with a bounded, dated Microsoft Release Health snapshot without claiming that a matching record proves this device is affected.

Input
3–12 relevant lines
Processing
Browser-local
Output
Facts + limits + next evidence step

Runs locally in this browser

Check one update and symptom

Include the installed Windows version/build, the exact KB when known, and the concrete symptom. A match is a Release Health correlation, not a device-level root-cause verdict.

What to enter Copy the version and OS build from Settings → System → About, the KB from Windows Update history, and the exact symptom or message. Do not paste product keys, recovery keys, account details, or full logs.

0 / 40,000 characters · recommended 3–12 relevant lines

Examples
No upload · No pasted-evidence storage · No AI-generated interpretation

Dated first-party snapshot

Records included in this checker

Reviewed 2026-09-01. The browser matcher compares only these 8 selected Microsoft Release Health records and stops calling the snapshot current after 14 days without review.

Confirmed

Incorrect notifications that “Microsoft Defender Antivirus is turned off”

Notifications can state that Microsoft Defender Antivirus is turned off even though Windows Security reports it active and functioning correctly.

Affected versions
26H1 · 25H2 · 24H2 · 23H2 · 22H2
Originating update
N/A
Resolution update
No resolution KB documented
Microsoft attribution
Defender notification issue; originating Windows update not identified
Open official Microsoft Windows Release Health record
Reported

Microsoft has received reports of mouse customization settings being lost

Custom cursors or cursor animations can revert to standard settings after the August 27, 2026 update and later.

Affected versions
25H2 · 24H2
Originating update
OS Build 26100.9278 · KB5120998
Resolution update
No resolution KB documented
Microsoft attribution
Microsoft is investigating whether this is caused by Microsoft
Open official Microsoft Windows Release Health record
Resolved

Some games become unresponsive when certain drivers are present

Certain games can become unresponsive, close, show EXCEPTION_ACCESS_VIOLATION, or restart the device when an inpoutx64-like RGB component is present.

Affected versions
25H2 · 24H2
Originating update
OS Build 26100.9168 · KB5121003
Resolution update
No resolution KB documented
Microsoft attribution
Not caused by Windows updates
Open official Microsoft Windows Release Health record
Resolved

Some Dell devices with a specific Intel driver might experience poor performance

A limited set of Dell devices with the Intel Innovation Platform Framework Processor Participant driver could show a Device Manager warning and performance, power, or behavior changes.

Affected versions
25H2 · 24H2
Originating update
OS Build 26100.8737 · KB5095093
Resolution update
KB5121767
Microsoft attribution
Windows and Intel driver compatibility issue on affected Dell models
Open official Microsoft Windows Release Health record
Resolved

May 2026 security update might fail to install with error 0x800f0922

The May 2026 security update could roll back near 35–36% with 0x800f0922 on devices with very limited free space in the EFI System Partition.

Affected versions
25H2 · 24H2
Originating update
OS Build 26100.8457 · KB5089549
Resolution update
KB5089573
Microsoft attribution
Windows update issue on devices with limited EFI System Partition free space
Open official Microsoft Windows Release Health record
Resolved

Microsoft account sign ins might fail for Microsoft Teams Free and other apps

Microsoft-account sign-ins could fail in Teams Free and other apps while Entra ID business sign-ins were not affected.

Affected versions
25H2 · 24H2
Originating update
OS Build 26100.8037 · KB5079473
Resolution update
KB5085516
Microsoft attribution
Windows update issue affecting Microsoft-account authentication in selected apps
Open official Microsoft Windows Release Health record
Resolved

Updates installed via WUSA might fail if installed from a shared folder

WUSA installation could fail when an update was launched from a network folder containing multiple .msu files.

Affected versions
25H2 · 24H2
Originating update
N/A
Resolution update
KB5079391
Microsoft attribution
Windows Update Standalone Installer path-handling issue
Open official Microsoft Windows Release Health record
Resolved

Windows Server Update Services sync operations might have issues or time out

WSUS synchronization could take longer or time out because publishing metadata accumulated in existing installations and on the service side.

Affected versions
26H1 · 25H2 · 24H2 · 23H2 · 22H2
Originating update
N/A
Resolution update
KB5121986
Microsoft attribution
WSUS metadata and service-side degradation
Open official Microsoft Windows Release Health record

A matching row is a correlation point, not proof that a device is affected. A no-match result does not prove that Microsoft has no other current or historical issue.

What the checker does

Compare exact device facts with a dated first-party status snapshot

Extracted fields

  • Snapshot review date and freshness
  • Release Health record title
  • Microsoft status
  • Affected Windows versions
  • Originating KB/build
  • Resolution KB where documented
  • Matched input cues
  • Microsoft attribution boundary

Supported input

  • Selected current or recently resolved Windows 11 Release Health records
  • Exact KB/build plus symptom comparisons
  • Version-scoped status-notification comparisons
  • One device symptom description at a time

Not supported

  • Automatic live Microsoft Graph queries
  • Every historic or enterprise-only known issue
  • Proof that this device is affected
  • Registry, update-uninstall, or driver-removal instructions
  • Root-cause or repair scoring

Official structure and interpretation boundary

Reviewed sources

Continue the same task

Windows Update diagnosticsOpen the task-specific routeSystem Information readerOpen the task-specific routeWindows Update / CBS readerOpen the task-specific route

Local-first utility

Privacy

The diagnostic parser, evidence readers, verification loop, and Evidence Pack run in your browser. TechClassy does not intentionally store the raw text you paste, Event Viewer or update-log excerpts, full command output, usernames, local file paths, dump files, device serial numbers, observations, parsed summaries, or generated Evidence Packs.

No advertising, analytics, session replay, account system, upload surface, or third-party diagnostic script is loaded in this release. Standard hosting security logs may contain request metadata such as time, requested path, and network information; diagnostic and evidence text is not sent as a URL parameter or API body by the tool.

Use boundary

TechClassy organizes evidence and reviewed next checks. It is not a substitute for Microsoft, an OEM, an employer's IT team, or a qualified repair professional. Results distinguish confirmed facts from possible causes and do not guarantee a repair.

Back up important data before making system changes. Stop when an action requires credentials, firmware changes, disk work, account recovery, or a command whose prerequisites you cannot verify.

Independent operation

This is a newly researched, independently operated diagnostic product. It does not claim to be the prior TechClassy editorial team or a continuation of prior authorship.

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