Q&B 2004-address book/invoicing problem

Several months ago while trying to put in an invoice for a new customer, Quicken refused to let me save the invoice because it said that the address given was different than what was already recorded
(illogical, since customer not in address book to begin with). I tried the "UPDATE" address book option, but it would continually give me the same error message when I went to save the invoice. Trying the other option available when that message comes up, I tried to create an alternative entry for the person. Same message.
Since then I;ve tried everything I can think of to troubleshoot the problem. I can create new invoices for old clients but not for any new ones. I can create invoices for the new clients and print them from the screen, but since I can't save them, it's useless for tracking and audit purposes.
I have exported the customer list and examined it for anything that looked odd and can't find anything. I have entered the new customer from the address book first before invoicing them, and although the address comes up correctly, it still won't save the invoice.
I have validated the file with no obvious errors. I have very a small address book and even smaller number of customers. Has anyone ever encounterd this oddity or have any suggestions for what else I can try to eliminate or work around it?
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