I have an accounting interface module in my application, which I provide to a vertical market. Some of my clients use the Quickbooks interface. This has been working fairly well for a couple years now.

One of my clients has informed me that now, when transferring invoices, QB says the import has been performed successfully, but can't see any reference to the invoices inside QB. In testing here, I see the exact same behavior.

I have looked at the .iif file, but I can't see anything wrong. Certainly QB is no help at all in determining the nature of this problem. Does anyone have any idea what might be happenning?

(BTW - I have already set the sales tax option off).

Thanks in Advance