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.