KB5063878: Fixed: You might need to press the Win + P keyboard shortcut twice to switch topologies.

August 12, 2025—KB5063878: Update for Windows Server 2025 (OS Build 26100.4946)

Improvements
This security update contains fixes and quality improvements from KB5062553 (released July 8, 2025) and KB5064489 (released July 13, 2005). The following summary outlines key issues addressed by the KB update after you install it. Also, included are available new features. The bold text within the brackets indicates the item or area of the change. ​​​​

• [Display] Fixed: You might need to press the Win + P keyboard shortcut twice to switch topologies.
• [Dynamic Host Configuration Protocol (DHCP Client)] Fixed: This update addresses an issue affecting internet connectivity on devices after resuming from sleep mode. Users might experience intermittent internet connections.
• [ExtFloodFill] Fixed: There's an uncommon issue with ExtFloodFill where a horizontal line might appear in the incorrect location in Win32 applications.
• [File Systems] Fixed: This update addresses an issue when the operating system stops unexpectedly, and an error message appears on a blue screen during normal usage with a user profile redirected to a network VHD(X).
• [File Explorer]

1. Fixed: As part of our ongoing commitment to improving File Explorer accessibility, this release includes increased support for the text scaling (Settings > Accessibility > Text size) across File Explorer, File Open/Save dialogs and the copy dialogs.
2. Fixed: Improved the performance of extracting zipped files, particularly in the case where you’re unzipping a large number of small files.
3. Fixed: The address bar in File Explorer might unexpectedly not show a path after opening.

• [Graphics] Fixed: External graphics cards connected over Thunderbolt might unexpectedly not be discoverable in some cases.
• [Hyper-V Manager] Fixed: Hyper-V Manager unexpectedly shows 0% CPU usage for virtual machines.
• [Imaging] Fixed: This update addresses an issue where some content pages with JPEG images were not displaying.
• [Input (known issue)] Fixed: An issue when using the Microsoft Changjie IME (input method editor) for Traditional Chinese might cause problems such as not being able to form or select words, unresponsive spacebar or blank key, incorrect word output, or a broken candidate window display. This can occur after installing KB5062553.
• [Networking] Fixed: This update addresses an issue affecting Storage Spaces Direct (S2D) and Remote Direct Memory Access (RDMA) with SMB Direct in certain network configurations. Previously, the issue disrupted network setup and caused a loss of cluster management capabilities.
• [Start]
• Fixed: You can’t use touch gestures to view the list of apps pinned in the Start menu.
• Fixed: The Sign out and More options​​​​​​​ buttons in the Start menu account manager might not be visible with increased text size.
• [Taskbar]

1. Fixed: The underlines beneath the app icons in the taskbar may remain visible even after the apps have been closed.
2. Fixed: If you use the arrow keys after pressing the Windows key + T, the arrows move in the wrong direction for Arabic and Hebrew display languages.

• [Windows Setup] Fixed: If you install Windows 11, version 24H2 with Windows Setup and run System Preparation (Sysprep) afterwards, the boot file configuration is not properly updated, resulting in push-button reset options not working.
• [Windows Update] Fixed: If you install Windows Server 2025 with Windows Setup and run System Preparation (Sysprep) afterwards, the boot file configuration is not properly updated, resulting in push-button reset options not working.
• [Desktop icons] The logic for apps pinned to the desktop has been updated, so that packaged apps no longer show an accent colored backplate. For example, if you were to drag and drop Snipping Tool from the apps list in Start to the desktop the icons should be bigger and easier to see now.