Hi Conor,
I really want to get FEC 1.8.1 working with this mod.
I've got a clean install of 1.3.9D, running on php5.3.0.
Only mods installed at this time are: FEC 1.8.1 and Ceon URI 3.6.3

On the checkout page, when clicking the "Change Address" button, FEC pops up a box for you to do that like so:



When URI is turned on, the box just keeps loading:



I've tried adding to the the exclude files:
/fec/fec_change_new_address.php?type=change_shipping_address,
/fec/fec_change_new_address.php?type=change_payment_address

Also added to .htaccess file:
Code:
RewriteCond %{REQUEST_URI} !^/facebox.* [NC]
RewriteCond %{REQUEST_URI} !^/fec.* [NC]
Is there anything else I could try to get these two fab mods to work together?

Thanks :)