Here's what's fixed, improved, and still broken in Windows 10 build 17666

Microsoft today released Windows 10 build 17666 at its Build 2018 developer conference, making it a Build build. It contains a ton of new features though, with a bunch of things that were announced this week at the conference. These include improvements to Sets, a dark theme for the File Explorer, Your Phone, improvements to Notepad, and more.

But as always, it does contain a list of fixes, improvements, and known issues. Here's what got fixed and improved:

  • We fixed an issue with dll from the previous flight that could result in explorer.exe crashing every few minutes.

  • We fixed an issue resulting in VPN potentially not working after updating to the previous build.

  • We fixed an issue from the previous build where apps may appear to be missing in secondary accounts after receiving app updates from the PC’s primary account.

  • We fixed an issue from the previous flight resulting in a bugcheck with the error IRQ_NOT_LESS_OR_EQUAL in tcpip.sys.

  • We fixed an issue where a border would be visible when you maximized windows in the last few flights.

  • We’ve updated the design of This PC so that there’s no longer space displayed for the cloud files state icon (which isn’t relevant on this page).

  • The snipping toolbar (with WIN + Shift + S) will now follow your desired theme, light or dark.

  • We fixed an issue that could result in the Emoji Panel and the touch keyboard not displaying correctly if invoked immediately after restarting explorer.exe.

Here are the known issues:

  • After completing the Windows Mixed Reality First Run experience, OOBE is black. Motion Controllers are also not recognized in exclusive apps. If you need your Mixed Reality experience to be working it is advised you not take this build until these issues are fixed.

  • On resuming from sleep, the desktop may be momentarily visible before the Lock screen displays as expected.

  • When Movies & TV user denies access to its videos library (through the “Let Movies & TV access your videos library?” popup window or through Windows privacy settings), Movies & TV crashes when the user navigates to the “Personal” tab.

  • We’re aware of an issue that causes Narrator to read extra text when invoking Alt + Tab, and we’re working on a fix.

  • If you complete the setup for a Windows Mixed Reality headset on this build, the headset will remain black until it is unplugged and reconnected to the PC.

Here are the known issues that have to do with Sets and Office integration only:

  • Sets UX for Office Win32 desktop apps is not final. The experience will be refined over time based on feedback.
  • The top of some Win32 desktop app windows may appear slightly underneath the tab bar when created maximized. To work around the issue, restore and re-maximize the window.
  • Closing one tab may sometimes minimize the entire set.
  • Tiling and cascading windows, including features like “View Side by Side” in Word, will not work for inactive tabs.
  • The Office Visual Basic Editor window will currently be tabbed but is not intended to be in the future.
  • Opening an Office document while the same app has an existing document open may cause an unintended switch to the last active document. This will also happen when closing a sheet in Excel while other sheets remain open.
  • Local files or non-Microsoft cloud files will not be automatically restored, and no error message will be provided to alert the user to that fact.

This is a major release, so you can expect to see some issues that haven't been found just yet. You should certainly be aware of that before installing a build from the Fast ring. Microsoft's Dona Sarkar recently said that the Slow ring should be receiving a new build from the Redstone 5 branch as well.

If you're on the Fast ring, you can get today's build by going to Settings -> Update & security -> Windows Update -> Check for updates. If not, you can sign up via the Windows Insider Program tab.

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