Hi, I read the entire board . I think I found the problem (SEF) but do not know how to solve. Practically it is not possible for my clients to checkout or register . It always redirects to a page where it asks me the login credentials , not the registration or checkout popup opens like in your demo .
Can someone help me?

Also Guest and register button points to: /component/virtuemart/editaddresscartBT?tmpl=component&flexible=register&Itemid=531

I disabled SEF and it work. How i can use SEF?

Hi,

Please see this topic:
www.flexiblewebdesign.com/forum-virtuemart-2-template-puremart-support/542-register-and-checkout-popup-goes-to-joomla-login#2261

Your problem is exactly the same. Just do what it says in the above topic and you will be good to go.

Regards.