How do I change the Invoice format to one I have created and exists in Invoice Format Forms?

I've created 2 Invoice formats. Both exist in Invoice Format Forms. One format has a logo one format does not have a logo. When I go to create a new invoice for a customer ("Invoice - Customer Invoices") the only format that is displayed in the Layout box is "Invoice Default" and under this is "<customize>".... neither of the two invoice formats which I created exists in this list thus, I cannot select or change the invoice layout. What am I doing wrong?????