When I try and check out, I receive a page that just lists [shoppingcart]. Do you know what's going on?
Sounds to me like you tried WPEC plugin before you tried WooCommerce. You need to change that shortcode to WooCommerce...sorry I don't recall it off the top of my head.
The shortcode for the cart page in the WooCommerce plugin is:
Replace the shortcode you now have, with this new one and you'll be good.
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