[Old] Royal Mail Modules

[babygekko]

I've been trying to use the Eurozone, International Datapost, and International Standard from the Big Royal Mail module version: 2.21a (latest).

All other Royal mail modules work, except those 3 above. They do display the quotes correctly, but then it keeps getting stuck. When selecting any of those 3 as a shipping option, it keeps going back to index.php?main_page=checkout_shipping and does not want to proceed to index.php?main_page=checkout_payment

Can anyone please shed a light on this thing? I've taken a look at the source code, trying to replace the function quote($method = '') with a simple function that returns an array from var_export but it still does not want to proceed to payment.

??

Here's a screenshot.