This is a quick and easy one.
If you’re using the Flatsome3 theme with WordPress and you have Varnish cache running, you’ll find the cart doesn’t work. You add an item, and the sidebar pops up but then it disappears again straight away, and the cart is empty.
Turn off Varnish and problem solved… but that’s not good enough.
Add these two rules and you’re golden:
URL exclude ^/(cart|my-account|checkout|addons)
Cookies exclude .*woocommerce.*