MarketPress Product Image Display Error

I have a fresh instillation of MarketPress with a single product using variations. I'm using the default Twenty Sixteen Wordpress Theme. When clicking on the image to preview the larger version of the image via ColorBox, the image does not display; it displays the default MarketPress product image instead. You can see a demo at the following page: http://marketpress.politicalcartoons.com/store/products/test-image/