Mouse pointer disappears after using the magnifying glass in the color picker

Hello,
I've a problem (one more) with Lion on a Mac mini 2010. Every time I select a color from the screen using the magnifying glass in the color picker, the mouse pointer disappears. I've to move the mouse to the top of the screen and try to click the bar menu. If I succeed, I get the pointer back.
Someone with the same problem?
Thanks for reading

I've found a partial solution: The probem doesn't affect to a new fresh user, so you can backup your data, create a new temporary (admin) user, delete the original account and create it again with the same name (to avoid file permission troubles). Remember to backup your data or it will be lost.

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