KB4550944

• Updates an issue with pasting mixed content of images and text from Microsoft Word into Internet Explorer.

• Addresses an issue that occurs when a third-party application loads hidden tabs into Internet Options.

• Addresses an issue with pasting mixed content of images and text from Microsoft Word into Internet Explorer.

• Addresses an issue that prevents the first key stroke from being recognized correctly in the DataGridView cell.

• Addresses an issue that causes an error in logman.exe. The error is, "A user account is required in order to commit the current Data collector Set properties."

• Addresses an issue that prevents users from setting the REG_EXPAND_SZ keys in some automated scenarios.

• Addresses an issue that causes a memory leak in the LsaIso.exe process when the server is under a heavy authentication load and Credential Guard is enabled.

• Addresses an issue with running klist.exe that causes lsass.exe to stop working and generates an access violation error (0xC0000005).

• Addresses an issue with merging Windows Defender Application Control policies that sometimes generates a duplicate rule ID error and causes the Merge-CIPolicy PowerShell command to fail.

• Addresses an issue that prevents applications running in an Azure Active Directory environment from receiving account change notifications. This occurs when using the Web Account Manager (WAM) and the WebAccountMonitor API.

• Addresses a Task Manager CPU frequency display issue that locks to the base frequency on devices equipped with certain CPUs.

• Addresses an issue that prevents Microsoft Internet Information Services (IIS) management tools, such as IIS Manager, from managing an ASP.NET application that has configured SameSite cookie settings in web.config.

• Addresses an issue that occurs when you try to sign in to Windows during recovery mode. The error, "No administrator accounts are available on this machine", appears.

• Addresses an issue that prevents you from removing some local users from local built-in groups. For example, you cannot remove "Guest" from the "Guests" local group.

• Addresses an issue that prevents certain apps from installing if they are published using a Group Policy Object.

• Addresses an issue that causes Microsoft Edge to stop working if you attempt to use paste functionality on webpages when cut-and-paste functionality has been disabled using a policy and Windows Defender Application Guard is active.

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