Flash only starts loading for some IE versions

...then won't load full site. Works in other browsers..help!

[fiddysticks]

My swf file loads/plays perfectly in Safari, Netscape, Firefox, but have had reports that it doesn't load for some IE users (they can see the start of the site, but it stops and the navigation won't appear).

But other IE users can see it?! (I think IE6). Unlike previous posts, there is no white screen - some of the file is loading.

Have spent hours researching, have taken out links to stylesheets, checked I have both the object and embed tags...but no luck!

here is the code:

<object classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000" codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=5,0,0,0" width="700" height="570">
<param name=movie value="/tophoto_final_06.swf">
<param name=quality value=high>
<embed src="/tophoto_final_06.swf" quality=high pluginspage="http://www.macromedia.com/shockwave/download/index.cgi?P1_Prod_Version=ShockwaveFlash" type="application/x-shockwave-flash" width="700" height="570">
</embed>
</object>

Anyone's help would be greatly appreciated. Thanks.