I've encountered a bug that rears itself every time I bring up an Alt+Tab task switcher box and then click outside of it into a window.
Once this is done, the switcher box goes away but the mouse focus gets lost. One can manually Alt+Tab to make windows active but no window (including kicker and kdesktop) can receive mouse input. If, however, a window's control menu is invoked with Alt+F3, any mouse clicks that have occurred since the focus was lost are rapidly transmitted sequentially. I've encountered this bug before (v 3.0?) but never bothered filing a report on it. Has anyone else run into it? I don't have access to my CVS machine right now so I don't know if this has been worked out.