When I try and load the following page (index.php?main_page=checkout_payment_address) during the checkout process after clicking the "Change Address" button to update the billing address on step 2 of 3 "Payment information" I get the following error;

Error!

Unable to determine connection method on a link!

Known methods: NONSSL SSL

The "checkout_shipping_address" update page works fine.

Any clues as why this error might be showing or how I can work around it?

Cheers
Will