I send my first invoice from Zoho Invoice, and when I've click on the send button, there were no confirmation for sending (I've seen the loading in the bottom bar of chrome). I was thinking, that wasn't been sent, so I click once again, the send an invoice form was still open with no confirmatio, and so I check for to be sure in my webmail (because I was in copy), and what a surprise to see that the message have been send twice !

So I think there's an issue with this feature.

Sarah