May 10, 2016 — KB3156387 (OS Build 10240.16854)

This update includes quality improvements and security fixes. No new operating system features are being introduced in this update. Key changes include:

• Fixed memory leak that occurs when opening a portable document format (PDF) form multiple times.

• Fixed issues with text alignment for right to left languages in Internet Explorer  11 and Microsoft Edge .

• Fixed issue that caused sign in to temporarily fail after a password change.

• Fixed issue that sometimes corrupts CompactFlash cards inserted into a card reader.

• Fixed issue with losing network connectivity intermittently when roaming between Wi Fi access points.

• Improved security in the Windows kernel.

• Fixed issue with revised daylight saving time.

• Fixed additional issues with Internet Explorer  11.

• Updated security for kernel mode drivers.

• Fixed additional security issues with the Microsoft Graphics Component, remote procedure calls, Internet Explorer  11, Microsoft Edge , Windows Journal, JScript, Schannel, Windows Shell, and Virtual Secure Mode.

For more info about the security fixes in this update and a complete list of affected files, see KB3156387.