@Matt Petersen: Can you try adding in the following CSS in “Appearance => Theme Options => Custom CSS” box.
#branding {
background: url("http://ip-corporation.com/wp-content/uploads/2013/08/ip_water_grey.jpg") no-repeat scroll 0 0 transparent;
}
One more thing I notice in your site is that you are directly customizing CSS in style.css. You shouldn’t edit any core theme files as when you update the theme it will be reverted back and your customization will be gone. So the only way to customize the CSS in either though Custom CSS box or by building child theme.