Screensaver currupts login screen?

Hi.
when I got logged out by the screensaver/energy saver and I hit a key or click with the mouse,
sometimes I do not see the normal login screen but just a the password enty textfiled only.
When I move the mouse around the screen, the underlying window gets restored blockwise.
A funny effect by the way :-)
But looks like the login screen forgets to redraw its view.
When you see it the first time you don't know what happens
and what the little text field is for.
I found this a litte disapointing regarding Apples image?
Greets,

Qustions:
Which iMac do you have? > How to identify iMac models
How much RAM does it have? > Does my mac need more memory?
Thoughts:
Complex Screensavers use lots of RAM and can cause problems for systems that have a minimal amount of RAM to run the OS X. 
Try disabling the Screensaver for a time by setting it to Never and use Display Sleep instead to see if that corrects the problem.
If your iMac only has 2GB of RAM or even 4GB for some, then you might want to upgrade your RAM. Because to me, it sounds like Lion is struggling to recover RAM from the Screensaver at login.

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