Cufon not working with Jquery UI Tabs

Question

Hi, I am using Jquery UI Tabs, and within some of the tabs there is some text with Cufon applied to it.

Works fine in all browsers apart from IE.

Example: http://78.136.1.18/taylor_houghton/account_management.aspx

All works fine until you click on one of the 'tell me more' links then click back to the far left tab and the Cufonated text in the tab content turns white/doesn't appear.

The only thing that has changed is that there is a parameter on the end of the url. i.e

/account_management.aspx*?tbs=2*

Can anyone see where my problem is?

Thanks