I'd start with fixing the xhtml validation errors. Some of them look trivial, but some might be the cure for the problem. Like a <p> tag inside a span (error #2) and divs inside spans (a couple of cases). Anyway if you clean up the validation problems you'll probably see 'visual discrepancies' go way down.

http://validator.w3.org/check?uri=http%3A%2F%2Fwww.letsgorockets.com%2F&charset=%28detect+automatically%29&doctype=Inline&ss=1&verbose=1

Thanks for your help EdB. I'm cleaning up the errors as we speak - I've eliminated about 1/3 of the errors already.

In your opinion, is the content not loading considered a visual discrepancy ? I wasn't sure if you saw something in IE or FF of greater concern to explain why the content does not load in a browser other than FF.

Thanks again for the help.

Some errors that are obvious...

<script type="text/javascript" src="http://embed.technorati.com/embed/hu2qyya7qb.js"</script>

should be..

<script type="text/javascript" src="http://embed.technorati.com/embed/hu2qyya7qb.js"></script>

Make sure all your "<br>" are "<br />"
Make sure all your "<img=blahblah>" end with "blahblah />"

There is a lazy <p> tag at the end of....

<ul><li><a href="http://b2evolution.net/" title="b2evolution home"><img src="../../img/b2evolution_button.png" alt="b2evolution" width="80" height="17" border="0" class="middle" /></a></li></ul><p>

Also check out the way you have your Tables set up.... I'm getting some errors for that as well.

Thanks John - the script error you pointed out immediately let the content load. I double checked all the <br /> to make sure they were correct and killed a couple floating unneccesary tags.

I see the table errors you mentioned, but i'm not sure exactly how to fix these. The HTML for the table is seems correct but the description of the error states:

One possible cause for this message is that you have attempted to put a block-level element (such as "<p>" or "<table>") inside an inline element (such as "<a>", "<span>", or "<font>").

Any suggestions for this one ?