Zen theme not compatible with IE8? I am using a zen theme, the default styles and template and while the Main content displays correctly in Firefox, it is all the way to the left in IE.

In firefox, Navigation menu on top, sidebar on the left, main content on the right.
In IE, Main content area on top, with navigation menu underneath and sidebar first underneat that. All left align...

What am I missing?

I just overrode all the css and everything and it is still displaying the same...
"I fixed the issue by setting the bandwidth optimization to: Aggregate and compress CSS files." said kine456.
kine456 answered his own question.

This is because js files like respond.js that comes with the zen theme must get applied after you aggregate the css files for it to look correctly in ie8. I'm pretty sure its documented in the theme's readme.