If you have upgraded your OS X Lion system to version 10.7.4, you may run into an issue where the log-in screen might appear black and not show the standard usernames and icons and the area to present your password. When this issue happens, if you move your mouse the system will reveal a small square of the log-in window underneath the mouse, and subsequent movement of this square will erase more of the black mask and further reveal the log-in window.
While perhaps confusing and odd for the user, this issue does not break the functionality of the OS X log-in window, and once users have revealed their account pictures, they can click on them and then provide their password as usual to log in.
The log-in window will appear black and only be revealed if you move your mouse around the screen.
(Credit: Screenshot by Topher Kessler/CNET)
The issue in this case is a bug in how the system updates the screen output after the log-in window is revealed, and Apple has identified it as a problem with what is being drawn on the screen when the system is automatically logged out. Apparently on some systems if the display is in sleep mode when the account is logged out, the black output to the screen will remain persistent when the ... [Read more]
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