Matt,
I changed the Transaction History value to ALL then triggered a full sync and the paid invoices are still not in the Customer screen Transaction tab. So that didn't fix it. QB shows the Invoices but Method does not. I exported all Invoice rows and they are not in the export. Looks like a bug in the MIE to me. Being able to see PAID invoices is crucial in a CRM. As soon as QB sees an invoice is paid, it disappears from Method, which is a bad thing.
ALSO in the forum notification email I got when you replied to the Case, the wrong URL is in the email. It should be to a method.me forum link but it has methodintegration.com link. It was http://www.methodintegration.com/cs/forums/p/5921/22292.aspx#22292 in the email....
Thanks.