FYI: Also posted a comment in themeforest.
Steps to reproduce.
Visit test site: http://weeklyfresh.wpengine.com/
Add a simple product to cart, then checkout using Stripe sandbox payment (4242 4242 4242 4242 and 01/23 expiration).
On order confirmation page I get a 404.
Also getting a 404 on this page and others linked to my-account:
Resolved by setting permalinks for Products back to "default"
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