Pluging doesn't seem to be working properly

Hello,

      I'm not really sure what I'm doing wrong here, but even the simplest of configs doesn't seem to be working for me. I've imported some sample products like the business card and the iPhone case, and when I create a new product and set its config in the metabox on the right to either of those and then view the product page, I don't get any product customization canvas. I've tried different themes but I still get nothing. Is there anything I'm missing?