I have a fresh installation of Joomla 2.5.7 with Gantry bundle installed, everything went fine.
I'm tweaking my gantry-custom.css, and i just realized that using ie9 i get a really weird blue header.
I thought it was something i did, so i removed all my tweaks, still getting a blue header.
I even tried a fresh gantry template, and it's still, literally, making me blue.