mystery taskbar window

  BlackLab 17:56 23 Jan 2005

After closing Internet Explorer or maybe Outlook and returning to the desktop there remains a blank "window open" (or does it mean "program running") window on the taskbar. It is not totally blank as it contains a little white square. Anyway this little window refuses to respond to left or right clicks and refuses to go away. It has gone after re-booting the system. I am running XP by the way. Any ideas.

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