WordPress HTTPS conflict with Easy Digital Downloads

Conflict outlined at this post:

https://easydigitaldownloads.com/support/topic/request-and-suggestion-for-your-cart-is-empty-problem/page/2/#post-291026

The most relevant parts of the description:

The conflict is with WordPress HTTPS version 3.3.6.

When it’s activated the “cart is empty” error happens, and when it’s deactivated, even with all my other plugins active, EDD works fine.

But the problem still happens only on a page under the /download directory that EDD created.

As before, even with all plugins activated, including WordPress HTTPS, the process still works fine from a button added to a page in my existing URL structure using purchase_link.

Same behaviour that I mentioned before on this topic, at this post:

https://easydigitaldownloads.com/support/topic/request-and-suggestion-for-your-cart-is-empty-problem/#post-286739

https://wordpress.org/plugins/wordpress-https/