Hi,
That’s strange… I have just rechecked it on my server and it seems to be working fine (with 0.5 set as minimum quantity for all products). Are you sure you are setting the new “Force initial quantity on archives” option to “Force to min quantity” (and not the old one “Force initial quantity on single product page” instead)?
I’ve also tried opening the link to your site but got “The connection has timed out” error.
Also if you wish you can create/share an admin account to your site, so I could log in and check what’s going on. My private email is [email protected].