I've fought with this for quite a while - my Pagelines installation continues to have trouble inside of IE9. Because I don't see any other threads on this topic, I assume no one else is having this problem.
My site is
I get two errors:
1) formatting is lost and sidebar drops to bottom of page on all pages/posts except homepage
2) homepage begins to load and then switches to just a white screen.
In image #1, IE9 renders the site without background, no sidebar, and the Fixed Navigation Bar changes from black to a gradient blue (deleting the links and search bar). The bottom screenshot is what it looks like inside of Chrome (and Firefox).
Image #2 shows what the homepage is supposed to look like. IE9 renders this as just white.
Given that just over 50% of site visitors are still using IE9 this is a significant problem.
I disabled all plugins this am to troubleshoot the errors. Even with all plugins disabled, it won't work. I get the exact same errors.