Windows 11 Build 23555 (Dev) comes with several fixes

Windows 11 Dev banner

Microsoft releases Windows 11 Build 23555 to Insiders who receive updates from the Dev channel. This time, the OS doesn't include new features, at least none is officially claimed. Instead the release is focused on fixes and improvements.

What's new in Windows 11 Build 23555 (Dev)


  • Fixed an issue that caused explorer.exe to crash when trying to open Copilot from the taskbar.
  • Fixed an issue that prevented Narrator from hearing natural voices before making a selection.
  • Fixed an issue that prevents Narrator from correctly speaking the timestamp for recommended items in the Start menu.
  • Fixed an issue that caused Task Manager to crash when selecting the On Top mode.

Note. Some of the fixes listed above may be included in cumulative updates for release versions of Windows 11.

Known Issues

Start Menu

Some apps in the Start menu's All Apps list (for example, PWA apps installed through Microsoft Edge) may appear as system apps when they are not.


  • [New] The new Copilot icon does not appear in Dev channel builds. It will be updated in future builds.
  • Insiders on the Dev Channel are reporting that the preview version of Windows Copilot is not available in some regions. Engineers have already discovered the problem. The feature will become available to these users in upcoming builds.
  • You can use Alt+Tab to exit Windows Copilot, but not to return to it. To go to Windows Copilot, use the combination WIN + C.
  • When you first launch or after updating Copilot, when using Voice Control, you must use the Show grid command to then move to the Ask me anything field.


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Author: Sergey Tkachenko

Sergey Tkachenko is a software developer who started Winaero back in 2011. On this blog, Sergey is writing about everything connected to Microsoft, Windows and popular software. Follow him on Telegram, Twitter, and YouTube.

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