Microsoft pushed the September 2025 Patch Tuesday rollup to Windows 11 today, a cumulative release that—according to community reporting—carries the usual mix of security fixes, quality improvements and targeted Copilot reliability updates, but also surfaces a handful of user-facing regressions administrators and enthusiasts should know before they patch widely.
Background / Overview
Microsoft’s monthly Patch Tuesday remains the primary delivery vehicle for Windows security and quality updates. September 2025’s release (reported under KB identifiers circulating as
KB5065426 and
KB5065431) is being distributed as combined packages (servicing‑stack + cumulative update) for affected branches, and community outlets are already digging into the telemetry and known‑issue list that accompanies the rollout. Independent reporting highlights that this cadence continues the company’s approach of bundling Servicing Stack Updates (SSU) with Latest Cumulative Updates (LCU) to reduce sequencing errors during mass deployment, but that packaging also limits simple rollback options and complicates recovery workflows in some edge cases. The most visible items in today’s discussion fall into two categories:
- Copilot-related UI and compatibility quirks on multi‑monitor systems and with third‑party wallpaper apps.
- An Out‑of‑Box Experience (OOBE) language button translation quirk that affects freshly imaged devices created from certain older OEM images.
These issues are not necessarily new — the Copilot multi‑monitor behaviour echoes prior known incidents — but they matter because Copilot’s increasing integration across the OS raises the surface area for small changes to interact with vendor tools and OEM imaging in unexpected ways. (
bleepingcomputer.com)
What the September 2025 rollup reportedly changes
High‑level contents
- Security fixes for a broad roster of CVEs across Windows components, continuing the regular hardening cadence.
- Quality updates that target graphics, File Explorer and other frequent user pain points.
- Conditional AI/Copilot component refreshes that may install only on eligible Copilot+ hardware or devices meeting licensing and firmware criteria.
These are consistent with Microsoft’s recent policy of discreetly distributing AI binary updates to compatible devices while keeping the LCU surface general-purpose. Independent coverage of the patch window notes similar priorities and warns admins about the Secure Boot certificate rollout work that remains an operational program spanning multiple updates.
Packaging and rollback considerations
Because Microsoft continues to ship combined
SSU + LCU packages, rollback is non‑trivial. The SSU component is effectively non‑removable once installed; removing an LCU in a combined package requires DISM removal of the LCU package name (not wusa /uninstall). That makes
testing and staged rollouts more important than ever for organizations with strict change control policies.
The Copilot multi‑monitor and wallpaper problems — summary and verification
The symptom set
Community and vendor reporting summarize two classes of user-facing behaviour after installing recent Copilot‑related updates:
- On systems using more than one monitor, desktop icons may move unexpectedly between displays, or suffer alignment issues when Copilot is invoked. Microsoft previously described this as a known issue and — to reduce user exposure — placed a compatibility hold for Copilot on devices that had been or were currently used in a multi‑monitor configuration. (bleepingcomputer.com)
- Third‑party wallpaper apps (for example, Wallpaper Engine or Lively Wallpaper) can stop rendering the custom wallpaper while Copilot is open, causing Windows to show the default or a Windows‑set wallpaper instead. Users reported having to restart or re‑initialize the wallpaper tool to recover. Similar behaviour has been discussed in community threads over multiple months as Copilot’s desktop integration evolved.
What Microsoft and reporters have said
Microsoft publicly documented the desktop‑icon issue in a known‑issues entry when Copilot preview features rolled out previously; their guidance was to hold Copilot availability on affected multi‑monitor devices rather than risk a broken desktop for users. Independent outlets (Windows Central, BleepingComputer, Neowin) covered those advisories and tracked the subsequent fixes and compatibility lifts as Microsoft resolved the root cause on the service side for specific branches. (
bleepingcomputer.com, borncity.com, support.microsoft.com, windowscentral.com, reddit.com, windowscentral.com, Windows 11 (KB5065426, KB5065431) September 2025 Patch Tuesday out