Every time I add something to the shopping cart, then click on cart, the shopping cart is empty....
Please try to update WooCommerce to v2.0.x. Afaik some servers had problems with php sessions and the woocommerce devs decided to switch to a transient based system to save the user input/data. You also need to update your theme to version Replete v1.3.1 because your version (1.0) is not compatible with WooCommerce 2.0 anymore. You can download the theme update for free from themeforest.net.
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