Try disabling all active plugins except for woocommerce. Then refresh the page a few times so you've cleared your local cache and try it again.
I'm getting a few errors when the cart attempts to reload and I'm guessing there is a conflict with one of the plugins.
You can also download the most recent theme files from your Downloads on Themeforest and then upload the updated files in the same way you first installed the theme. That way you have the newest bug fixes. If you've made any changes to the actual theme files, you'll need to back those up so they can be re-applied.