Since installing Messenger Plus (which i love btw)  I have been getting a strange intermittent error.  The advertisement window at the bottom of the MSN window, overlays on whatever is the currently active window.

You can see it on the attached image, being overlayed on top of my web browser.

So the question.  Does anyone know whats causing it or how i can fix it?

Any help would be much appreciated, its sitting on top of movies i'm trying to watch!