PMyers21 on "[Plugin: WooCommerce - excelling eCommerce] 500 Internal Server Error with Internet Explorer"

Hello, when using IE and clicking on a product picture, then clicking "add to cart" I'm getting a 500 Internal Error message. This only happens in Internet Explorer browser. Safari, Chrome, Firefox all work great.

Anyone have an idea what it could be?

Thanks

http://wordpress.org/plugins/woocommerce/