How to set up country zones for flat rate shipping?

[Ajeh]

If you have bad data, then that is something you need to fix to verify that the default is a valid address book entry ...

You might try testing your database tables to see if the:
customers
address_book

have matching records for the customers field:
customers_default_address_id

and the address_book on:
address_book_id

[Alho1]

Thank you for all your assistance, Ajeh. Very much appreciated. Now I know what the problem is, I can deal with it. I will need to look again at database export/import procedures, to see if there's something I'm missing in the procedure ...

Regards,

al