Landing page and error pages show blank in IE9

All of the text seems to be there and everything seems to be working, but there is no background which makes everything unreadable.

![screen shot 2013-05-08 at 12 54 47](https://f.cloud.github.com/assets/109850/478591/8efa5090-b7fe-11e2-804f-a6739b256aa3.png)