WooCommerce reports:
“This plugin is incompatible with the enabled WooCommerce feature ‘High-Performance order storage’, it shouldn’t be activated.”
This happens so frequently that I never normally bother activating the plugin. I thought I’d try it again as I’m working on a new build that includes ecommerce at the moment. As much as I dislike the vanilla WooCommerce offering, it is far more preferable to the plugin breaking the checkout process - which is what happens whenever there’s an update with WooCommerce (that is if Woo doesn’t object as soon as the plugin is activated).
Hopefully this will be put right some day.