Yes, you are correct. I am running Evolve 2.6.6 with WordPress 4.5.2 and reduxframework 18.104.22.168 and woocommerce 2.6.1
The update cart button and proceed to checkout button does not work on shopping cart page.
I am attaching screen-cast of my test.
It probably has to do with changes in woocommerce template.
I will report this issue to our developers now.
Please wait for fix in theme update.