Trouble with EOS theme

Hi, hoping someone out there can help me figure out what happened to my blog. I’ve been using EOS for a while and love it. However, the formatting has recently stopped working on Chrome and IE. Firefox seems to render the theme fine but the other two break in different ways. I’ve re-installed 3.0.4 twice. I’ve also deleted and re-uploaded/activated EOS twice. I’ve checked my wp-config.php file for a leading space before the <?php

I have the following plugins:
akismet v2.5.2
easy timer v2.4
wordpress.com stats v1.7.5

I’ve created a 2nd install of wordpress and uploaded/activated EOS and all the same plugins and it renders fine in Chrome so the problem is not the theme itself. Something broke and I can’t figure out what. I don’t have any edits or hacks and I wasn’t aware of doing anything specific that preceeded the theme breaking. The default theme works fine.

pictures below show how the broken blog renders in each browser.

anyone have any ideas? thanks!

firefox
chrome
IE