After I upgraded to version 7 a couple of users noticed the site layout was very strange in older versions of IE. We use Simplicity_div as our default layout
Using IE6 using this theme the site seems to display the center panels below the last active panel on the right hand side (shoutbox in this case)
I have several custom panels but these have been disabled to take the following screenshots. I have also checked on php-fusion and it does the exact same thing here :o
It's not a problem with the theme, it's a problem with Internet Explorer, as that stubid browser doesn't render ANY site according to the W3C, which today is the official webstandards!
I'll take a look into it, and post this to our Theme Development Team. Also, you might be able to get faster support posting this at http://themes.php-fusion.co.uk :)