Windows 10 builds 15063.632 and 14393.1737 now available - here's what's new

Today isn't Patch Tuesday, or any kind of Tuesday for that matter, but Microsoft still released a pair of cumulative updates. The new updates are for users of the Windows 10 Anniversary Update and Creators Update, and they come in the forms of builds 14393.1737 and 15063.632, respectively.

Normally, new updates arrive on the second Tuesday of the month, although it seems to be more and more common for Microsoft to release two in a month, at least for some versions of the OS.

Users on the Creators Update will see KB4040724 (15063.632), which you can manually download here. Here's what's been fixed:

  • Reliability improvements and fixes for cellular connectivity.

  • Addressed issue in Microsoft Edge where on first launch after installing KB4038788, or periodically thereafter, users may observe performance issues or unresponsiveness until the next launch of the browser.

There's also a known issue to be aware of:

Symptom Workaround
Installing KB4034674may change Czech and Arabic languages to English for Microsoft Edge and other applications. Microsoft is working on a resolution and will provide an update in an upcoming release.


KB4038801, or build 14393.1737 can be manually downloaded here, and contains a wider range of fixes.

  • Updated the BitLocker.psm1PowerShell script to not log passwords when logging is enabled.

  • Addressed issue with the Lock Workstation setting for smart cards where, in some cases, the system doesn’t lock when the smart card is removed.

  • Addressed issue where saving a credential with an empty password to Credential Manager causes the system to stop working when attempting to use the credential.

  • Addressed issue where an access token is improperly closed from a WMI query.

  • Addressed issue where the size of a cloned file was improperly calculated by ReFS.

  • Addressed error STOP 0x44 in Npfs!NpFsdDirectoryControl.

  • Addressed error 0x1_SysCallNum_71_nt!KiSystemServiceExitPico.

Unlike the update for version 1703, this one does not contain any known issues.

Naturally, there's no need to manually download any of these. If you head over to Settings -> Update & security -> Windows Update -> Check for updates, your machine will download the corresponding update automatically.

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