Microsoft has released a new Insider Preview build for Insiders on the fast ring, for both PC and mobile which is excellent news. But, with all Insider Preview builds, there's a list of things you should watch out for. Here's everything you need to know regarding issues and fixes in build 14946.

Improvements and fixes for PC

  • Optional components such as Hyper-V and Bash should remain installed after updating to this build.
  • We have fixed the issue where signing into games that use Xbox Live would not work. You should be able to sign-in to Xbox Live in games in this build.
  • We fixed the issue causing Microsoft Edge to sometimes crash on launch, or when you type in address bar or try to open a new tab. You no longer need to run the PowerShell script.
  • We fixed the issue causing touch scrolling to be too sensitive in Windows 10 apps, such as Microsoft Edge.
  • We fixed an issue where Explorer.exe would hang when attempting to open considerably large .MOV files.
  • We fixed an issue that could result in the network icon occasionally getting into a state where a red X would display in the taskbar despite an active internet connection, until the device had been restarted.
  • We fixed an issue where if the device's brightness was automatically adjusted after being woken from sleep, the brightness level shown in the Action Center's Brightness Quick Action might not reflect the current brightness of the device.
  • We fixed an issue leading to Narrator not tracking focus on the Start Menu All apps list or tiles.
  • We fixed an issue potentially resulting in the "Open with…" dialog displaying with two entries for Calculator after tapping the Calculator key on a keyboard or running the Calculator app.

Improvements and fixes for Mobile

  • We fixed the issue causing you to get into a state where text messages will fail to send.
  • When your phone is connected to your PC, long lists of captured photos will now load significantly faster in File Explorer.
  • We've updated Narrator's reading order for Windows 10 apps which display an app bar on the bottom of the app, for example OneDrive, so now the contents of the page will be read before the contents of the app bar
  • We fixed an issue resulting in video thumbnails sometimes not being shown in WhatsApp – videos received from this build onwards will display a thumbnail.
  • We fixed an issue resulting in Camera app video recordings having a slight crackle to their audio in recent builds.

Known issues for PC

  • If you have 3rd party antivirus products such as Bitdefender, Kaspersky Antivirus, F-Secure Antivirus and Malwarebytes installed on your PC – your PC might not be able to complete the update to this build and roll-back to the previous build.
  • Larger Windows Store games such as ReCore, Gears of War 4, Forza Horizon 3, Killer Instinct and Rise of the Tomb Raider may fail to launch.

Known issues for Mobile

  • If your phone has additional speech packs installed – this build will fail to install on your phone with an 0x80188319 error. This is why we polled Insiders about language pack usage this week. Based on the response, we decided to push forward and send the latest bits. This issue will be fixed in the next build we release. NOTE: Removing speech packs will not correct the issue. Your device will continue to try and download and install the update and fail. It is recommended you move to the Slow ring until this issue is fixed. This has been mitigated and fixed

That's everything you should watch out for in build 14946 for PC and mobile, for a list of what's new, check out our main Windows 10 Build 14946 post!