Just added to my client's site (in one widget at http://www.leslievernick.com/newsletter-archive/)
Nothing is happening when I submit names and email addresses. It just refreshes to the blank entry again.
My shortcode is [contesthopper contest="2130"]
is there anything that shows up in your php logs?
alternatively, try to turn on debug mode - http://codex.wordpress.org/Editing_wp-config.php#Debug
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