checkout issue

hi there,
i've updated the domain plugin to the latest version and found out that it's causing the issue with the shopping cart.
what's happening is once i've updated from 3.0.8 version, whenever i go to the checkout, the payment bit down the page is constantly loading (it's some kind of jquery thing). i've been testing it on http://www.paddymilner.com which is on my multisite.
i guess it must have something in common with: * FORCE_SSL_LOGIN compatibility
* FORCE_SSL_ADMIN compatibility update, as the shopping checkout was working good up until the 3.0.8.1 and newer updates (i've tested them all).

any chance to look into that?
thanks,
Adam