1. I've updated the php.ini
2. I can upload a 5mb image to both WordPress, and the FPD
3. HOWEVER, when I try to add to cart, image uploads, then the cart page never shows up, it crashes the browser.
Anyone have any ideas?
Max upload size is ok, memory is ok. Designer works fine with smaller images.
Not really, no. You could open a support ticket (with a URL, etc) and we could take a look at it there