Woo Commerce 404 Page Error for Checkout – DEVASTATED

I own a health site (proletehealth.com) where there’s an attached store from which I sell supplements. Whenever I try to checkout, I get a 404 page error. This is a problem with any checkout pages. The cart works just fine and all account pages work fine. It’s just /checkout/, /checkout/pay, and /checkout/order-received that don’t work.

I’ve already verified that all pages exist and that there are no broken links. [woocommerce_checkout] appears on the appropriate page.

I’m using WooCommerce 2.0.14.

I tried changing my permalink structure, but it made my cart page stop working — so I changed it back to the current structure which is:

Common settings: post name
Product permalink base: default

I’m using the theme Enfold by Kriesi

My plugin list (both inactive & active) is:
Acurax social media widget 1.3
Askimet 2.5.9 (inactive)
bbPress 2.4
Captcha 3.8.2
E-MAILiT Social Media Sharing Widget 3.5
Go Daddy Quick Setup 1.04 (inactive)
Hello Dolly 1.6 (inactive)
Jetpack by WordPress.com 2.2
MailChimp for WP Lite 1.2
Meeting Scheduler by vCita 3.1.0
Simple Facebook Plugin 1.2.2
Welcome to WordPress 1.0 (inactive)
WordPress Social Ring 1.2.3
WP-PostRatings 1.7.4

Any help would be greatly appreciated. I am truly just frustrated and annoyed that just those checkout pages don’t work.