We are running ZCM 2017 Update 2 on Windows 7. The last logged in user is displayed after log out rather than the standard username/password screen. The GPO for Interactive logon: Do not display last user name is enabled on the device.

We have created a bundle to empty the following registry entry which stops the last logged in user from displaying.

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\Curr entVersion\Authentication\LogonUI]
"LastLoggedOnUser"=""

The issue does not occur when Zen is not installed on the device.