Windows 10 build 15042

Windows 10 build 15042 is the twenty-first officially released Insider Preview build of Windows 10 Creators Update. This build was released to Windows Insiders in the Fast Ring on 24 February 2017.

Changes

 * Changed Cortana's animations in OOBE.
 * A dialog has been added when Adobe Flash content is blocked in Microsoft Edge. It is located in the URL bar.
 * When reading a locally saved EPUB book in Microsoft Edge, A book icon is used in place of the previous generic icon.
 * If you switch pages while an EPUB book is being read, the reader will jump to the specified page.
 * If you've changed the read aloud settings when reading an EPUB in Microsoft Edge, the settings you chose will now be preserved for other e-books that are opened afterwards.
 * Removed the watermark and timebomb temporarily.

Bugs

 * Some machines may still experience constant crashes with the  service, causing PCs to lose audio, disk I/O usage to become very high, and apps like Microsoft Edge to become unresponsive when doing certain actions. To fix this, stop the Spectrum service, navigate to C:\ProgramData\Microsoft\Spectrum, delete the PersistedSpatialAnchors folder and reboot.
 * Some games might minimize to the taskbar when launched.
 * Microsoft Edge F12 tools may intermittently crash, hang, and fail to accept inputs.
 * The icon for the Windows Insider Program under Settings → "Update & security" is shown as a square instead of its usual icon.
 * Windows Hello authentication may not work on some Surface Pro 4 and Surface Book devices.
 * Microsoft Edge and/or the taskbar may randomly stop responding. If that happens, open Task Manager via Ctrl and close Microsoft Edge and restarting.

Updates
Only two updates were released for build 15042:
 * 10.0.15042.2.rs2_release_inmarket.170226-0342 - KB4014173
 * 10.0.15042.3.rs2_release_inmarket.170303-0911 - KB4014621