Have a fairly simple banner ad created in Mac OS. Previews fine locally. Previews fine in Safari on Mac as standalone file and dropped in to iframe on Wordpress page (just like a Nivo slider on same page. Also previews in Safari using IE user agent string. When viewed in any browser on Windows OS, no animation display; either as standalone or loaded into iframe. Possibly something simple: a CSS visbility? Some Windows security thing? Any advice appreciated.
Address to standalone file: http://www.hanglide.com/banner/banner.html