What's probably happening here, is when your adding the product your instructing Zen to use an image already on the server. If that's the case, make sure your not putting a / before the image name.
In the meantime, I've written into your code a snippet to remove the forward slash. But to be safe, just don't use it.
NOTE: Other images within your cart aren't showing, probably cause you haven't uploaded them yet. Just wanted to be sure your aware.
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