Applies to: Mac OS X 10.7, 10.8
If a system is configured to enable monitor sleep and auto logout, it can cause a condition where the screen will go blank and does not display the login window.
Moving the mouse will create pixelated lines that display the desktop items but not the login window.
This is an Apple issue and is not specific to Centrify
To avoid this issue, it is recommended to change the value for monitor sleep to be longer than the value for auto logoff.
The other workaround is to disable monitor sleep.
Apple has not provided an "official" response to this at this time.
Example of the behavior: