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Introduction: A Preview Update That May Have Gone Too Far
Windows updates are supposed to make a computer safer, smoother, and more capable. But Microsoft’s latest Windows 11 preview update is doing the opposite for some users, creating a frustrating collection of visual problems that can make an otherwise perfectly working PC feel broken.
The Problem Behind KB5120998
Microsoft’s August 27 Windows 11 preview update, identified as KB5120998, has been linked to problems involving mouse cursor customization. Users who installed the update have reported that personalized cursor settings can suddenly disappear, revert to Windows defaults, change size, or become difficult to see.
When Your Cursor Suddenly Looks Wrong
For users who spend time customizing Windows, the problem can be particularly annoying. A carefully selected high-DPI cursor may suddenly be replaced by a large white pointer, while custom cursor animations can return to their standard Windows versions.
Some Cursors May Disappear Entirely
The problem is not limited to appearance. Microsoft says some reports describe intermittent animation changes and situations where the cursor may become difficult to see or effectively disappear.
Microsoft Acknowledges the Cursor Bug
Microsoft has added the issue to its Windows 11 known issues information. The company says reports indicate that mouse cursor personalization settings may be modified or reverted after installing the August 27 update.
Customization May Not Survive a Reset
One of the more frustrating aspects of the problem is that simply going back into Windows settings and selecting the preferred cursor may not solve the problem permanently. According to the reports cited by Microsoft, attempts to restore previous cursor customization can be unsuccessful.
Why This Update Is Different
There is an important detail that Windows 11 users should understand: KB5120998 is a preview update.
It Is Not the Normal Mandatory Patch
Unlike Microsoft’s regular monthly security updates, preview updates are optional. They are designed to let users test upcoming fixes, improvements, and features before the next major monthly release.
Why Users Still Install Preview Updates
Preview updates can nevertheless be tempting because they often contain features people have been waiting for. Windows Update can also present them prominently, making it easy for users to install them without realizing that they are effectively testing an early version of the next month’s update.
New Windows 11 Features Add to the Temptation
KB5120998 is not simply a collection of minor changes. The update previews several Windows 11 improvements, including a more flexible Start menu, changes involving the taskbar, and a redesigned Search experience.
The Trade-Off for Early Features
That creates an unfortunate trade-off. Users who install the preview get access to new functionality earlier, but they also accept a greater possibility of encountering bugs that Microsoft is still investigating.
The Wallpaper May Be Broken Too
The cursor issue may not be the only visual regression associated with the update. Reports have also surfaced describing Windows 11 desktops suddenly displaying a black wallpaper instead of the user’s selected background.
Feedback Hub Reports Are Adding Pressure
Users have reportedly submitted wallpaper complaints through
Blurry Fonts Are Another Concern
Some systems are also reportedly experiencing blurry fonts after installing the preview update. This problem appears to be less widespread than the cursor and wallpaper complaints, and Microsoft has not officially acknowledged the font problem at the time of the original report.
Why Font Rendering Problems Matter
Blurry text might sound like a cosmetic inconvenience, but it can become a serious usability problem on high-resolution displays. When Windows suddenly renders text poorly, everything from File Explorer to applications and system menus can look less sharp.
High-DPI Users Could Be Especially Frustrated
High-DPI displays already require careful scaling and rendering. When an update interferes with cursor size, cursor graphics, or font rendering, the effect can be much more noticeable on modern laptops and high-resolution desktop monitors.
Microsoft Is Investigating
Microsoft says it is investigating the cursor problem to determine whether the update is responsible. That distinction matters because software problems can sometimes result from interactions between Windows, drivers, third-party customization software, and hardware configurations.
A Fix Has Not Yet Arrived
At the time described in the original report, Microsoft had not provided a permanent fix for the cursor issue. The company said it would provide additional information as its investigation continued.
September Patch Tuesday Creates a Deadline
Because KB5120998 is a preview of the September Windows update, Microsoft has an opportunity to address the problems before the regular release scheduled for September 8.
The Preview Gives Microsoft Valuable Testing Time
That is one of the main purposes of preview updates. Problems discovered by early adopters can potentially be identified and corrected before the changes reach the much larger population receiving the standard monthly update.
The Safest Choice for Affected Users
For people already experiencing the cursor problem, the practical solution described by Microsoft is to remove the preview update.
How to Uninstall KB5120998
Open Settings and select Windows Update.
Find Your Update History
Inside Windows Update, scroll down and select Update History. This page displays the updates that have recently been installed on the computer.
Open the Uninstall Section
Scroll through the Update History page until you find Uninstall updates. Select it to open the list of removable Windows updates.
Identify the Problematic Package
Look for:
2026-08 Preview Update (KB5120998) (26200.9278)
Remove the Update
Select the Uninstall option next to KB5120998 and confirm the removal when Windows asks for confirmation.
Restart and Test Windows
After the update has been removed, restart the computer and check the mouse cursor, wallpaper, and font rendering. If the update was responsible for the problem, the affected settings should return to their previous behavior.
Do Not Rush to Reinstall It
If your computer works correctly after uninstalling KB5120998, there is little reason to immediately install the same preview package again. Waiting for Microsoft’s corrected version may be the more sensible approach.
What Undercode Say:
Preview Updates Are Not Always Worth the Risk
The biggest lesson from this incident is simple: optional preview updates should be treated differently from ordinary security patches.
Early Access Comes With a Cost
Getting new Windows features several days or weeks early can be attractive, but users are effectively volunteering to encounter unfinished software behavior.
Cosmetic Bugs Can Become Serious
A broken cursor might initially sound insignificant, but the mouse pointer is one of the most fundamental elements of a graphical operating system.
The Cursor Is a Core Interface Element
If the cursor becomes invisible, oversized, incorrectly animated, or difficult to distinguish from the background, basic computer interaction becomes unnecessarily difficult.
Personalization Problems Are Particularly Annoying
Windows users often spend considerable time customizing their systems. An update that silently replaces those choices creates a poor user experience even if the underlying operating system remains technically functional.
High-DPI Users Deserve Special Attention
The mention of high-DPI cursor replacement is especially interesting because modern displays depend heavily on accurate scaling.
Scaling Is Increasingly Complex
Windows must coordinate display scaling, cursor rendering, application interfaces, GPU drivers, and accessibility settings. A small regression in one component can produce highly visible consequences.
Microsoft’s Investigation Matters
The fact that Microsoft is investigating whether the update directly caused the cursor problem is important. Not every problem appearing after an update is necessarily caused by that update.
Timing Alone Does Not Prove Causation
Users may notice a problem immediately after installing a patch, but software environments are complicated. Drivers, third-party utilities, personalization applications, and system configurations can all interact.
Multiple Reports Strengthen the Case
However, when numerous users independently report similar behavior after the same update, the possibility of an update-related regression becomes much harder to dismiss.
The Wallpaper Issue Deserves Attention
The black wallpaper reports are also worth watching because they suggest that the problems may extend beyond cursor rendering.
Several Visual Problems Point to a Pattern
Cursor corruption, wallpaper resets, and reports of blurry fonts all affect the Windows visual layer. That does not prove that they share the same technical cause, but the common timing makes further investigation reasonable.
The Font Problem Is Less Certain
The blurry-font issue should be treated more cautiously because Microsoft had not officially acknowledged it in the original report.
Fact and User Reports Should Be Separated
This distinction is important when covering Windows problems. Confirmed Microsoft issues should not be presented as equivalent to anecdotal reports from users.
Preview Builds Naturally Generate More Reports
A preview update is specifically designed to expose problems before a broader rollout. More user reports are therefore not necessarily evidence that Windows is becoming fundamentally unstable.
The Bigger Issue Is Testing
The real question is whether
Millions of Hardware Configurations Create Complexity
Windows runs across an enormous range of PCs, monitors, GPUs, drivers, mice, accessibility configurations, and third-party software environments.
No Test Lab Can Reproduce Everything
Even extensive internal testing cannot perfectly reproduce the combinations encountered on real-world computers.
Feedback Hub Becomes Critical
This is where Microsoft’s Feedback Hub becomes valuable. It provides a mechanism for collecting information from systems that may behave differently from Microsoft’s internal test environments.
Users Become Part of the Testing Process
Anyone installing a preview update is effectively contributing real-world feedback to Microsoft’s development cycle.
That Does Not Make Every Bug Acceptable
Users can reasonably expect Microsoft to minimize regressions, particularly when changes affect basic operating-system functionality.
Optional Updates Should Be Clearly Communicated
Microsoft could also make the distinction between preview and mandatory updates more obvious to ordinary users.
Many Users Do Not Understand Preview Labels
The average Windows user may see an available update and assume that installing it is simply good maintenance.
“Available” Can Feel Like “Required”
If Windows presents an optional update prominently, users may not realize that they can safely wait.
Waiting Is Sometimes the Better Strategy
For a normal home computer that does not need a preview feature, patience can be a very effective troubleshooting strategy.
Security Updates Are Different
This does not mean users should routinely ignore security updates. Regular security patches and optional previews serve different purposes.
Feature Enthusiasts Have a Different Calculation
Power users who want early access to Windows improvements may reasonably accept the risks.
Businesses Should Be More Conservative
Organizations should generally have even stronger reasons to deploy preview software because a visual bug can quickly become an operational problem when multiplied across many machines.
The September Release Will Be the Real Test
Microsoft’s response before the September 8 release will be more important than the existence of the preview bug itself.
A Quick Fix Is Better Than a Quiet Rollout
If Microsoft identifies the root cause and corrects it before the regular update, the preview incident becomes a useful example of the testing process working as intended.
Repeated Problems Would Be More Concerning
If the same cursor, wallpaper, or rendering problems survive into the regular release, the situation becomes considerably more serious.
Users Should Monitor Their Systems
Anyone who installed KB5120998 should pay attention to unusual cursor behavior, wallpaper changes, display scaling problems, and other unexpected visual regressions.
Keep Track of Recently Installed Updates
Knowing which update was installed immediately before a problem appeared can dramatically simplify troubleshooting.
Uninstalling Should Not Be the First Move for Everyone
If your system is working normally, there is no need to panic or automatically remove an update simply because other users have experienced problems.
Affected Users Have a Clearer Decision
If the cursor is suddenly broken or customization has disappeared after KB5120998, uninstalling the preview update is a much more reasonable step.
The Incident Highlights a Larger Windows Reality
Windows 11 is no longer a single standardized environment. It is a massive software ecosystem running on countless combinations of hardware and configurations.
Every Major Update Carries Some Risk
Even mature operating systems can introduce regressions. The goal is not to eliminate every bug, which is unrealistic, but to detect serious problems quickly and correct them before broad deployment.
Microsoft’s Response Will Define the Story
The most important part of this incident may ultimately be what happens next.
A Fast Patch Could Restore Confidence
If Microsoft fixes the issue before the September release, users may view the preview incident as an unfortunate but useful testing discovery.
A Repeated Regression Would Be Different
If users receive the same broken behavior in the regular update, criticism of Microsoft’s quality-control process will become much harder to dismiss.
The Practical Bottom Line
For now, affected users have a straightforward option: remove KB5120998, restart Windows, and wait for Microsoft’s investigation and a corrected release.
Deep Analysis: What Is Happening Under the Hood?
The Windows Update Package
KB5120998 is a Windows 11 preview package. Windows stores installed update information in the servicing stack, allowing administrators and advanced users to identify packages that may need to be removed.
Check the Installed Updates
PowerShell can be used to inspect recently installed Windows packages:
Get-HotFix | Sort-Object InstalledOn -Descending
Search Specifically for KB5120998
You can check whether the update is installed with:
Get-HotFix -Id KB5120998
Remove the Update With DISM
On systems where the package is exposed through the servicing system, an administrator can inspect installed packages with:
DISM /Online /Get-Packages
Locate the Matching Package
Search the output for a package associated with KB5120998. The exact package identity can vary, so administrators should verify the complete package name rather than blindly copying a command from another system.
Remove a Verified Package
Once the exact package identity has been confirmed, DISM can remove it using:
DISM /Online /Remove-Package /PackageName:<PACKAGE_NAME>
PowerShell Alternative
Administrators can also inspect Windows servicing packages through PowerShell:
Get-WindowsPackage -Online | Where-Object {$_.PackageName -match "KB5120998"}
Do Not Guess the Package Name
The important point is to identify the actual package returned by the system before attempting removal. Using an incorrect package identifier can produce an error or remove something unrelated.
Check Windows Build Information
To understand your current Windows build, run:
winver
Use System Information for Additional Diagnostics
You can also collect basic Windows version information with:
systeminfo
Check the Event Logs
For deeper troubleshooting, Windows Event Viewer can be opened using:
eventvwr.msc
Examine Graphics-Related Events
If blurry fonts or cursor rendering problems continue after removing the update, administrators should investigate display-driver and graphics-related events rather than automatically blaming Windows Update.
Verify Display Scaling
Windows display configuration can also be checked from:
Settings → System → Display → Scale
Check Mouse Customization
Cursor settings can be reviewed under:
Settings → Accessibility → Mouse pointer and touch
Restore the Cursor Manually
If Windows has reset the pointer, users can return to the mouse-pointer customization controls and select their preferred size, color, and appearance.
The Registry Is Not the First Fix
Advanced users sometimes turn to Registry modifications when Windows personalization breaks. That should not be the first response here.
Why Registry Tweaks Can Make Things Worse
Changing undocumented or poorly understood registry values can introduce additional configuration problems and make Microsoft’s eventual fix harder to diagnose.
Driver Troubleshooting Comes Later
If removing KB5120998 does not resolve the issue, the next investigation should include the mouse driver, graphics driver, third-party cursor software, accessibility tools, and display configuration.
Safe Mode Can Help Isolate Software Conflicts
Windows Safe Mode can be useful for determining whether third-party software is interfering with cursor behavior.
Keep the Troubleshooting Process Controlled
The best approach is to change one major variable at a time. Uninstalling the suspected preview update, rebooting, and testing provides much cleaner evidence than simultaneously changing drivers, registry settings, and personalization files.
✅ Microsoft Acknowledged the Cursor Issue
Microsoft has documented reports that mouse cursor personalization settings can change or revert after installation of the August 27 Windows 11 preview update. This is the strongest confirmed element of the story because it comes from Microsoft’s own known-issues reporting.
✅ KB5120998 Is a Preview Update
The update is an optional preview rather than the normal mandatory monthly security release. Users generally do not need to install a preview package simply to keep Windows receiving regular updates.
✅ Uninstalling the Update Is the Reported Workaround
For users affected by the cursor regression, uninstalling KB5120998 is the practical workaround described in the original report. Users should verify that they are removing the correct update before proceeding.
⚠️ Wallpaper and Font Problems Need More Caution
Reports of black wallpapers and blurry fonts add to the concerns surrounding the update, but they should not automatically be treated as equally confirmed Microsoft bugs. The original reporting indicates that Microsoft had not acknowledged the font issue at that point.
Prediction
(+1) Microsoft Will Likely Correct the Cursor Regression
Because KB5120998 is a preview of the September release, Microsoft has a built-in opportunity to address the cursor problem before the update reaches a much wider audience.
(+1) Most Users Will Never Encounter the Bug
Preview updates are installed by a smaller portion of the Windows population. Users who skip optional previews may receive the corrected version without ever experiencing the regression.
(+1) Cursor Customization Should Return to Normal
Once the underlying issue is corrected, affected users should be able to restore custom cursor sizes, themes, animations, and high-DPI pointer behavior without needing permanent workarounds.
(-1) More Visual Regressions Could Surface
The cursor issue may not be the final problem discovered during testing. Additional reports involving wallpapers, fonts, scaling, or other Windows interface elements could emerge as more people experiment with the preview.
(-1) Users Who Reinstall Too Quickly Could Repeat the Problem
If someone removes KB5120998 and then manually reinstalls the same preview package before Microsoft publishes a fix, the original problem could return.
(+1) The Incident Could Improve the Final September Release
The best-case scenario is that real-world reports expose the regression early enough for Microsoft engineers to correct it before the September 8 rollout.
(-1) Repeated Regressions Would Damage Confidence
If the same problems make it into the regular Windows release, users may become increasingly reluctant to install optional Windows previews and less confident in Microsoft’s update quality control.
The Bigger Prediction
The most likely outcome is not a permanently broken Windows 11 experience. It is a temporary preview-update regression that Microsoft identifies, fixes, and eventually replaces with a corrected package. For most users, the sensible strategy is simple: if KB5120998 is causing problems on your PC, remove it and wait for the corrected release rather than fighting the operating system with increasingly complicated tweaks.
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