Microsoft has released Windows 10 Insider Preview Build 20152 to Insiders on the Dev Channel (formerly Fast ring)​. The release doesn't include a single new feature, but comes with a list of fixes (and known issues).

Fixes

• We fixed an issue that could result in Notepad unexpectedly being removed after resetting your PC. If you were impacted by this, you can reinstall Notepad via Optional Features in Settings.
• We fixed an issue where the “Windows needs space to continue” dialog might have told you to select Continue but no Continue button was displayed.
• We fixed an issue that could result in the Windows Update icon unexpectedly not appearing in the notification area of the taskbar when an update was ready for reboot.
• We fixed an issue that could result in an IME typing as if it was ON, when it was actually in OFF state, and tapping the IME mode indicator in the taskbar wouldn’t change the mode.

Known issues

• We’re working on a fix for an issue causing some systems to crash with a HYPERVISOR_ERROR bugcheck.
• We’re looking into reports of the update process hanging for extended periods of time when attempting to install a new build.
• We’re aware of an issue where Notepad might fail to reopen files which were automatically saved during a PC restart (if that option is enabled in Settings). Documents can be recovered from %localappdata%\Notepad.
• Some Insiders may experience a bugcheck and rollback when attempting to update to this build if an Xbox controller is connected to your device. You may see error code 0xc1900101 in Windows Update History. To work around the issue, disconnect or unpair the Xbox controller to successfully update. (Please note that reconnecting the controller after the update will result in a bugcheck.)
• Starting with the last build, some games and applications may crash at launch or fail to install. We’ve identified the root cause and are working on a fix for a future flight.
• We’re investigating reports of the screen becoming dimmer after upgrading to the previous build.
• We’re aware of an issue where Task Manager reports 0.00 GHz CPU usage in the Performance tab.
• We’re working on a fix for an issue causing Reset this PC to always show the error “There was a problem resetting this PC” when launched from Settings. To work around the issue, use Advanced Startup (Windows RE) to start Reset this PC.

The Fast ring, now known as Dev Channel, reflects the latest changes made to Windows code base. It is a work-in-progress, so the changes you see in Fast Ring releases may not appear in the upcoming feature update. Due to the changes coming to the Dev builds, it is possible that will see some of Windows 10X features on Desktop. Microsoft may want to roll out Windows 10X's features to test them with a larger number of devices. So we can expect to see some features which will never appear in stable Windows 10 versions on Desktop.

If you have configured your device to receive updates from the Fast Ring ring, open Settings - > Update & recovery and click on the Check for Updates button on the right. This will install the latest available Insider Preview of Windows 10.

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