Windows 10 Insider Preview build 16215 for PCs: What's been fixed... and what hasn't

Today, following a three-week wait, Microsoft released Windows 10 Insider Preview build 16215 for PCs in the Fast ring. The new build brings a huge range of new features and improvements - but as you would expect, it also includes a range of fixes, and some known issues to be aware of before you install it.

First, let's take a look at what's been fixed in build 16215:

• Language Packs via Settings > Time & language > Region & language are available again starting with this build.
• The issue causing updating to the latest builds to get stuck at 12% should be fixed. If you still hit this, please send us feedback in Feedback Hub so the team can investigate.
• We fixed the issue causing you to be unable to type in your password to log in to any UWP apps such as Netflix, Twitter, Facebook, Instagram or Messenger apps.
• We fixed the issue causing Outlook 2016 to hang on launch due to an issue where the spam filter gets stuck reading the Outlook Data File and the UI waits indefinitely for it to return.
• We fixed an issue from the previous flight where Microsoft Edge would crash when enabling or disabling extensions.
• We’ve removed the power option to “update and shutdown” for now as it wasn’t working.
• You may see Recovery Drive tool show up under “Recently added” on Start after updating to this build. We have made a change that makes the tool, previously only accessible via Control Panel, to now be available in the Windows Administrative Tools folder in Start.
• We fixed an issue where an unexpected Wireless Display Media Viewer app with a blank icon was visible in Start after upgrading on certain devices.
• We’ve made some improvements to our facial recognition, along with a new toast you’ll see prompting you to further train Windows Hello if having issues signing in when a large amount of backlighting detected.
• We fixed an issue resulting in Windows Hello Face failing to work on the previous flight for a large number of non-English languages.
• We fixed an issue resulting in games such as Civilization VI, Galactic Civilizations III, and Expeditions: Viking failing to launch on recent builds.
• We fixed an issue where inbox UWP app icons were overscaled in Cortana search results.
• We’ve heard your feedback, and have adjusted the text in our prompt to initiate cross device notifications from saying “Trust this PC?” to now say “You got a message on your phone. Want to see phone messages on this PC too?”.
• We fixed the issue causing some people to hit Error 0x8000ffff while trying to launch an isolated Edge session in Windows Defender Application Guard.

Make sure you also read through these known issues:

• On some PCs with enterprise configurations, you may not be able to open PDFs in Microsoft Edge on this build. As a workaround, you can download PDFs and open them with a third party reader or the Reader app from the Windows Store.
• Microsoft Edge may load web pages at the wrong scale factor (highly zoomed in) on some devices with high density displays. As a workaround. switching to another tab and back should resolve this problem.
• Some PDFs may open in a cropped view (zoomed in) in Microsoft Edge, and part of the content may be inaccessible to the user. Additionally, input to these PDFs may be offset to the wrong location on screen. As a workaround, you can download PDFs and open them with a third party reader or the Reader app from the Windows Store.
• After upgrading, inbox apps that are the same version on the downlevel OS and uplevel OS will disappear from Start. If you are impacted by this, please go to Settings > Apps > Apps & Features, select the impacted app, tap “advanced options”, click reset, and that should fix it.
• We’ve made a fix to address your feedback that PDFs aren’t opening in Microsoft Edge. This will resolve the issue for most Insiders, however we’re still investigating one issue specific to those with Windows Information Protection (EDP) enabled. We’re working to address this as soon as possible in an upcoming flight.
• New Windows Mixed Reality developers need to install build 16193 or RS2 RTM, plug in the Windows Mixed Reality headset and set up Mixed Reality, then upgrade to the latest FAST build for the best development experience. If you update to Build 16215 without setting up Mixed Reality, you will not be able to download Mixed Reality software. You will end up with multiple copies of each printer after upgrading. Only the copy with the highest number will work.
• Wi-Fi will get turned off on certain devices like the Surface Pro 1 and Surface Pro 2 and some USB devices and won’t work due to a driver issue. To get Wi-Fi working again, you will have to roll-back to the previous build.
• If you’re using a Chinese IME and try to type in Cortana, it will hang Cortana and not work.
• Some UWP apps such as Twitter will crash on launch.
• After updating to this build, Microsoft Text Input Application might appear on your All apps list and when you try to open it, it opens as a blank window.
• The mini surveys we call SIUFs from Feedback Hub will not work on this build but please send us feedback as you normally would for this build!

The possibility of UWP apps being more likely to crash in this new build could be a deal-breaker for some Windows Insiders.

If you're not comfortable dealing with any of these issues, you can skip this build by going to Settings > Update & security > Windows Insider Program, and switching to the Slow or Release Preview rings. Microsoft only releases more stable builds to those rings, and you can always switch back to the Fast ring at a later date.