I've had this problem ever since getting my Mac.

I'm currently running a MacBook Pro, 2.66GHz, bought last year. For some reason, the buttons in Snow Leopard--whether the directional ones in the Picture Viewer, or buttons in Adobe/Word, or the little red window closing buttons in Safari--stick.

For example, if I have 3 safari windows open and close one, the one behind it appears. If I try to click the close button on that one, nothing happens. The button does not click. I have to move the cursor around, click elsewhere on the page, then scroll up to click it. This happens all the time. The page is "selected" in Finder, it's not just sitting there visible in the background.

Does anyone know why my Mac goes this?