OK I looked at in IE6 & 7 and I see that black area too in both. And I also looked in Firefox and it was OK just as you said. This is indeed strange. Have you tried just saving the head as a png instead of using the export png? Maybe there is something in the export that is causing it. Since the head.png is not a transparent image I think just the "Save As" and png file would be OK. Just guessing at this point though.