Keyboard Backlight Won't Turn Off

Since installing Leopard, the backlight on the keyboard of my MacBook Pro has not turned off. I went into the preferences and unchecked and checked the "illuminate keyboard" button in the Keyboard & Mouse section, but for some reason it's still on. Anybody know why this might be happening? I'm not sure if it's related to Leopard or not, but still, I don't want the light to burn out because it's now on 24/7, whether the room is dark or not.

Alex,
I don't know why it's happening but rest assured that you are not alone.
I am having this problem too. Besides of the backlight, the keyboard will sometime feel unresponsive.
Ugghhh

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