I would suspect video memory involvement. When you click on the title bar it is usually to move the window. That freezes the redraw of that window freeing up resources. Is this a shared memory video card? Is windows handling the resources for that?
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Test machine:
Vista Home Premium / Toshiba Satelitte X205 / 2.0GHz Core2 Duo / 2GB memory / 2x NVIDIA GeForce 8600M GT
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