Black screen when attempting to exit iTunes Artwork screensaver

Hi,
When I click the "exit" button on my iTunes Artwork screensaver, a black screen with my cursor appears; the login box ought to be there so I can enter my password to log back in, but it isn't visible. I am using a 2012 Macbook Air running Mountain Lion. I have to close the laptop and reopen it in order to get the login screen to appear.
Any help would be greatly appreciated!

Usually I just wait and click around then the black screen goes away, but maybe that's not working for you. Currently I don't think there is a solution to the problem, except for waiting, or closing your MacBook. It's also weird for me because after upgrading to Mountain Lion I RARELY get the iTunes Artwork screen saver anymore. My MacBook usually just falls asleep (goes to a pitch black screen) and when I wake it up I just get the login box. I don't know what the problem is with either of these things, but it has to do with Mountain Lion.
- Daniel 

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