Windows 10 build 18323 (19h1 release)

Windows 10 build 18323 is the twentieth Insider Preview build of Windows 10 May 2019 Update. This build was released to Windows Insiders in the Fast Ring on 24 January 2019.

Changes

 * Winver now reports itself as "Version 1903" instead of the "Version 1809" that was used in previous builds.
 * Made various improvements to the Light theme.
 * Search and Cortana are now separated by default.
 * Removed the redesigned Japanese IME that was introduced in build 18277. It was brought back to Windows Insiders in May 2020 Update build 18875.
 * General changes, improvements, and bug fixes listed in the official release announcement.

Bugs

 * The Windows Security app may show an unknown status for the Virus & threat protection area, and sometimes it may not refresh properly.
 * Opening games that use anti-cheat software will trigger a green screen of death.
 * Sometimes clicking your account in Cortana permissions won't bring up the UI to sign out from Cortana (if you were already signed in).
 * Creative X-Fi sound cards do not function properly on this build.
 * While the bug that was causing the built-in night light to not work correctly was fixed, bugs still persist with other blue light reduction software not working.
 * When using Reset this PC and Keep my files is selected on a device that has Reserved Storage enabled, the user will need to initiate an extra reboot to ensure Reserved Storage is properly working again.
 * Some Realtek SD card readers do not function correctly with this build.
 * USB devices including mice and keyboards may stop working after upgrading. The possible workarounds are to change which USB port it is plugged into or connect the device through a USB hub.
 * Black screens may be consistently encountered when using Remote Desktop, DisplayLink, or Miracast if the system uses an AMD or Nvidia driver. The workaround is to run the following command:
 * The Narrator Settings value “Change the level of detail Narrator provides about text and control” may be empty. To work around this issue, use the Narrator command Narrator key + V to change the verbosity level, then close and reopen the Settings app again.
 * After upgrading, you may hear two Narrator voices talking at the same time. To fix this, reboot the machine and the duplicate voice will disappear.
 * For some users, Windows Sandbox may open to a black screen instead.
 * The Windows Insider Program page in Settings have a bug that prevents Narrator and other screen reader programs from properly reading the page.
 * Sometimes taskbar icons may stop loading and appear blank as a result.
 * Desktop Windows Manager will crash if multiple Office and/or video playback applications are running on the same screen on devices that have Multiplane Overlay Support.