After upgrading WooCommerce, the styles on my product pages do not look right anymore. When I look at the CSS in Firebug, it's not loading any WooCommerce styles (like it used to in the previous version of WooCommerce).
Here's an example of my dev site (where I'm using Woo Commerce 1.6.3) and the styles are correct:
And here's the live site where things are broken:
What am I doing wrong and how to I get the WooCommerce styling to return?