Cannot customize theme on multisite


It appears that the customize option for the themes does not work in a multisite environment? i have a fresh wordpress installation, your domain mapping plugin and only your themes, i can edit on the primary domain "" but once i go to the other domain the customize button throws a javascript error (below), can you advise on how to proceed in order to get this working?

SecurityError: DOM Exception 18: An attempt was made to break through the security policy of the user agent.

Blocked a frame with origin "" from accessing a frame with origin "". Protocols, domains, and ports must match.

Thanks for the help.