Windows 10 Insider Preview Build 14951 for PC and Mobile arrives on the Fast ring

The previous two Windows 10 Insider Preview builds -- 14942 and 14946 -- introduced some fairly major new features to the OS, including the ability to collapse the App list in the Start menu, longer Active Hours settings, and precision trackpad improvements.

Today, Microsoft rolls out yet another new build, keeping up the weekly frequency. Build 14951 introduces yet more big improvements, including two large updates to the Windows Subsystem for Linux.

The WSL updates are official Ubuntu 16.04 support and Windows / WSL interoperability. Ubuntu 16.04 will be installed for all new Bash on Ubuntu on Windows instances from this build. Existing users can upgrade manually from 14.04 to 16.04 using the do-release-upgrade command. As for the Windows / WSL interoperability, users can now launch Windows binaries directly from a Windows Subsystem for Linux command prompt. Go here for more details.

The previous two builds introduced improvements for precision trackpads, and this new build offers additional customization options. There are improvements to the recently updated Narrator also, as well as improvements to Windows Ink on PC. You’ll now be able to change both the color and width using pen drop downs, and there's a new Stencils feature too.

The Camera app has been updated this week, and gains a simplified interface, and some new features, including the option to set a photo timer from the camera dashboard, easier access to Settings, a new zoom slider, and the ability to use the spacebar to take pictures on the PC.

Other improvements and fixes for PC

• Fixed the issue causing PCs that are capable of Connected Standby such as the Surface Book and Surface Pro 4 to sometimes bugcheck (bluescreen) while in Connected Standby.
• Fixed an issue resulting in Forza Horizon 3, Gears of War (and some 3rd party games) failing to install from the Store with the error code 0x80073cf9 when the system’s app install location was set to drive with native 4k Sectors (or 4k sector sized drive).
• Fixed an issue resulting in larger Store games such as ReCore, Gears of War 4, Forza Horizon 3, Killer Instinct and Rise of the Tomb Raider possibly failing to launch.
• Fixed an issue where the console window (which hosts Command Prompt, PowerShell, and other command-line utilities) might not snap correctly to the inside edges between two monitors with different DPI scaling.
• Fixed an issue where all agenda items in the taskbar’s Clock and Calendar flyout were using the primary calendar’s color, rather than matching their respective calendar’s colors as selected in the Outlook Calendar app.
• Fixed issue where the Add PIN button in Settings > Accounts > Sign-in Options was sometimes unexpectedly greyed out for domain-joined devices.
• Fixed an issue resulting in Groove crashing if you tried to reorder the songs in a very large playlist.
• Migration logic updated to now include custom scan code mappings. That means that going forward from this build, if you’ve used Registry Editor to remap certain keys (for example, Caps Lock key to null), that change will persist across upgrades.
• Fixed an issue Insiders may have experienced resulting in Adobe Photoshop Express crashing after clicking on the ‘correct’ button when trying to edit a cropped image.
• Fixed an issue resulting in .csv or .xlsx files downloaded from Microsoft Edge sometimes unexpectedly appearing to be locked for editing by "another user" when SmartScreen was enabled.
• Fixed an issue where enabling the RemoteFX adaptor for a Virtual Machine would result in it failing to power on with the error ‘Unspecified error’ (0x80004005).

Known issues for PC

• Signing into apps such as Feedback Hub, Groove, MSN News, etc. with your Microsoft Account if you sign out or get signed out of these apps will not work. If this happens to you and you cannot sign in to Feedback Hub, you can send Microsoft feedback via the forums.
• You may experience a crash while using the protractor in Sketchpad -- Microsoft is working on a fix.
• If you have a 3rd party antivirus product installed on your PC -- your PC might not be able to complete the update to this build and roll-back to the previous build.

Improvements and fixes for Mobile

• Following feedback discussing French punctuation rules, Microsoft has updated French keyboards (with the exception of French (Canada), for which these rules don’t apply) to now add a space both before and after when using two-part punctuation marks, such as the semi-colon, the colon, the question mark and the exclamation mark.
• Fixed an issue resulting in the Camera shutter sounds entry missing from the Sounds Settings page via Settings > Personalization > Sounds.

Known issues for Mobile

• Signing into apps such as Feedback Hub, Groove, MSN News, etc. with your Microsoft Account if you sign out or get signed out of these apps will not work. If this happens to you and you cannot sign in to Feedback Hub, you can send Microsoft feedback via the forums.
• When rebooting a phone on this build and Build 14946 from last week, the device appears to get "stuck" on the blue Windows logo screen during the boot cycle. Microsoft has identified 2 bugs causing this issue and working to check in fixes soon. However, being "stuck" is only temporary. Depending on which device you have, your phone may be in this stuck state for 20-30 minutes, but it will eventually progress to the Lock screen. There is no permanent impact from these 2 bugs, just an unexpectedly long boot time. Please don’t reset your device! It’ll take longer to reset the device than it will to wait for the boot cycle to complete.
• Excel Mobile will freeze after adding sheets and eventually crashes.
• Insiders who have configured a data limit on their phone may get into a state where they receive frequent notifications about having exceeded this limit. To resolve the issue, please go into Settings > Device & Network > Data Usage and remove and recreate your data limit settings.

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