wont print/preview/email/pdf older invoices

overall is a great free app. do the job for simple invoicing. My experience is that after creating 5 invoices, i went back to the first invoice to print it but it wouldn’t. email/print/pdf/preview wont work for just that first invoice. the other invoices can be printed etc.
i dont know if that has to do anything about not paying for it, but its a simple bug that i am not willing to pay to test it or wait for updates. Thank you anyway!!

accordtl99 about Bill free - Invoicing made painless and fun