>>I'm fairly certain I've seen it on things besides the 'X'. I think I've seen it on menu items. I need to pay more attention. It seems to be a bug, and it would be nice to have it fixed.
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>Any button in windows will have similar behaviour.. Sometimes it's a quick way to not press a button that you accidentally clicked on - If you slide teh pointer off the button before releasing the mouse button, the button will not actually click. I've noticed this behaviour since way way back...
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>Jonathan Chan

I know what you are talking about. But it is worse (or less responsive) in VFP and in VFP applications.

You see the button depress down, but nothing happens. I've had it happen when I was moving the mouse slowly, and when I did not slide off the button between mouse down and mouse up.