embedded a FB Send button using xfbml in an empty page. Page hosted on RackSpace and has nothing else on it. The button appears and works normally, but after ~10 seconds disappears - only on FF and IE, not on Chrome. Facebook's xfbml code injects a span containing an iFrame that contains the button. When looking at the style of the span it seems that in Chrome width=50px height=20px but in Firefox height=width=0. Changing that manually causes the button to reappear.
Would really appreciate your help.
Thanks, Nir.