I just installed wpzon and am trying to get it working. I have an Amazon Associates account and had to create an Amazon Web Services (AWS) account in order to generate the access and secret keys.
I put the keys in the settings making sure there are no spaces before or after the numbers. The country is set to US and as a test I simply copy and pasted this demo shortcode to try it out:
[wpzon keywords="pressure cooker" sindex="Kitchen" snode="289825" sort="salesrank" listing="8"]
Nothing is showing up. Here's a post where I added the demo shortcode just below the heading "Tools You'll Need". It should appear between that heading and the toggle (+Wire stripper/crimper tool).
Any help is greatly appreciated!