plinio.crato on "[Plugin: WooCommerce - excelling eCommerce] Woocommerce 2.0.9 IE HTTP 500 Internal Server Error"

Before I use version 1.9, then upgraded to 2.0.9, my site stopped working using internet explorer, does not add to cart. The debugger console:

"- [15:58:08.166] POST http://localhost/produto/abrilhos-2011-george-macario/?add-to-cart=129 [HTTP/1.1 302 Moved Temporarily 1693ms]"

How to solve?
thanks

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