September 10, 2024—KB5043064 (OS Builds 19044.4894 and 19045.4894)

After installing this update, you might be unable to change your user account profile picture.

When attempting to change a profile picture by selecting the button Start> Settings > Account > Your info and, under Create your picture, clicking on Browse for one, you might receive an error message with error code 0x80070520. 

After further investigation, we concluded this issue has very limited or no impact for this Windows version.

If you encounter this issue on your device, please contact Windows support for help

After installing this security update, you might face issues with booting Linux if you have enabled the dual-boot setup for Windows and Linux in your device. Resulting from this issue, your device might fail to boot Linux and show the error message “Verifying shim SBAT data failed: Security Policy Violation. Something has gone seriously wrong: SBAT self-check failed: Security Policy Violation.”

The August 2024 Windows security update applies a Secure Boot Advanced Targeting (SBAT) setting to devices that run Windows to block old, vulnerable boot managers. This SBAT update will not be applied to devices where dual booting is detected. On some devices, the dual-boot detection did not detect some customized methods of dual-booting and applied the SBAT value when it should not have been applied.

Please refer to the workaround mentioned in Windows release health site for this issue.

After installing this update, you might experience a black screen when you login to Azure Virtual Desktop (AVD). You might also notice that you are unable to log out of your account and the black screen persists even after disconnecting and reconnecting to AVD. Resulting from this issue, the application event log in Event viewer will show an application error with Event ID:1000 indicating a fault with the application ‘svchost.exe_AppXSvc’.

Please note that AppX Deployment Service (AppxSvc) being in an invalid state could also cause other symptoms like the Start Menu to close unexpectedly due to registration issues. If you are observing the ‘svchost.exe_AppXSvc’ faulting application name in your application event logs, please apply the Known Issue Rollback (KIR) mentioned in the resolution section before trying to troubleshoot other symptoms.

This issue is addressed in KB5045594.

After installing this update, or subsequent updates, you might experience an extended black screen that stays between 10 to 30 mins when you login to Azure Virtual Desktop (AVD). Additional symptoms you might experience include:

• Failures related to single sign-on (SSO) experience on Office applications such as Outlook and Teams, which could prevent you from connecting to backend services or synchronizing data.

• Office apps display losing network connectivity even though other applications, such as Edge, retain intranet and internet access.

 This issue is caused by a deadlock in the interactions between the Azure Active Directory (AAD) broker and the underlying AppX deployment service(AppxSvc) and Background tasks infrastructure service. You are more likely to experience this issue if you are using FSLogix user profile containers on multi-session environments. FSLogix is a Microsoft tool that helps manage and speed up user profiles on computers, especially in virtual environments like remote desktops.

 Please note that this issue is different from the scenario where the AppX Deployment Service (AppxSvc) was in an invalid state, causing a black screen. That issue was resolved with Windows updates released on October 22, 2024 (KB5045594), and later.

We are investigating the issue and provide an update where more information is available.