Add Media fails

Hi I am currently looking for a stable ecommerce plugin that works with my current theme. So far !Ready Ecommerce is the only one that seems compatable with the theme. My only issue is that when I activate !Ready Ecommerce the “Add Media” button on the page screen stops working.
I would greatly appreciate any assistance here as I would love to get this up and running.

Many thanks,

Neil…

http://wordpress.org/extend/plugins/ready-ecommerce/