Hi Alex, I am using the “Taste” theme. I believe it’s one of the official free themes.
The preview works when I add more than one items to the cart. E.g. One with uploaded image A, one with another uploaded image B. Simply speaking, the live preview works as expected, except when changing quantity or removing items in the cart page.
After a browser reload, the previews show up again. So now I am forcing a browser reload 2 seconds after cart change. But of course, it’s not the most elegant solution.