Chris,
This error indicates that your host has enabled the PHP open_base_dir setting on your server. Your host needs to add your ZenCart installation folder to the allowed paths for this setting (i.e., add the file path referenced in the error as "not within the allowed path").
The open_base_dir setting is primarily used to prevent php scripts for a particular user from accessing files in another user's account. So usually, any files in your own account should be readable by your own scripts.
This setting could be why you are having so many issues. the version available for download in the Zen Cart Downloads section should be pretty easy to install. Just two files to upload and one file to alter.
I went to your site, and I do not see the error message at all. It looks fine to me.
When I perform a view source, I also noticed that the Google Analytics tracking is installed at the bottom of the page (correctly), HOWEVER, It also shows that you have the tracking code for "Conversion Tracking" at the bottom of the page as well.
If you are trying to track conversions of sales, then you should only include that Conversion Tracking code at the bottom of the checkout_success page. You also need to account for it being a SSL or Non-SSL connection.
Lastly, the code for Conversion Tracking should go just below the regular Google Analytics tracking code, but above the closing </BODY> tag. Right now you have it outside of the entire HTML document structure.
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