KB4550947

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

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

Addresses an issue with Dynamic Data Exchange (DDE) that causes a memory leak when multiple clients connect to the same server.

Addresses an issue that causes new child windows to flicker and appear as white squares on server devices that are configured for stark visual contrast.

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 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 that might cause a delay of up to two minutes when signing in or unlocking a session on Hybrid Azure Active Directory-joined machines.

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 might prevent Dynamic Host Configuration Protocol (DHCP) servers from providing the right options to clients when a reservation exists.

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 causes devices that are provisioned for Windows Hello for Business (WHfB) to fail. Registration occasionally fails, which leads to a delay in WHfB enrollment and, in some instances, creates Conflicting Objects (CNF) in the Active Directory “Registered Device” container.

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 logs incorrect Internet Protocol (IP) addresses in the audit logs because of missing or old data for active requests coming from "windowstransport/usernamemixed/certificatemixed" endpoints.

Addresses an issue that might cause a deadlock in the Remote Desktop Gateway service.

Addresses an issue in Srv2.sys that might cause 0x18, 0xC2, and 0x19 errors.

Addresses an issue that prevents the Notification State registries from being deleted for certain apps even after the user profile is deleted.