Thought I'd post here as well as in WooCommerce. Thread for WooCommerce is here http://wordpress.org/support/topic/solved-woocommerce-lost-password-403-error
Using WooCommerce 1.6.6
When on the My Account page and clicking on 'Lost Password' it gives an error page "Access to the webpage was denied".
After disabling Block Bad Queries plugin it worked fine.