I had similar to this problem. I accidentally clicked the archive button on an unpaid invoice in the "Manage Invoices" screen. I use the most recent invoice as my template for the next invoice as my invoices are nearly identical month-to-month. I could not figure out how to recover that invoice. Undaunted, I tried unarchiving an older invoice hoping I could use it as a template. No go! I still see no invoices in the "Manage Invoices" screen that I could copy and make a new invoice from. Ugh!
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