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Insider Build 18305.1005 Of Windows Sandbox Is Flawed

No longer may children play in the sandbox (for now).

A small cumulative update has broken one of the most important features of Windows 10 preview build 18305.

Microsoft released an Internet Explorer security patch on December 20, bringing the latest Windows 10 Fast ring Insider build to version 18305.1003. Microsoft confirmed this week in an update to the build’s list of known issues that the fix broke both Windows Defender Application Guard and Windows Sandbox (via OnMSFT).

From the press release:

  • [ADDED 1/1/19] Windows Sandbox and Windows Defender Application Guard fail to launch on Build 18305 with KB4483214 installed. The workaround for this update is to uninstall it.
    Microsoft will likely have a fix for the issue in its next Fast ring release, but for the time being, uninstalling the cumulative update is the only workaround.
  • Build 18305 introduced several intriguing new features, but Windows Sandbox has the potential to be one of the most surprising. The feature enables the creation of a virtual desktop environment in which untrusted software can be executed and tested without affecting the base installation. When Windows Sandbox is closed, all of its files and software are deleted irreversibly.

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