From any of the invoice views (i.e. all invoices) Click options and download PDF on an invoice that has already been paid, i.e. the balance is zero.
This returns “500 - Internal server error” on an Arvixe hosted Windows server. Sending an email with the invoice attached works fine and downloading invoices with a non zero balance also works fine.
PHP version 5.5
MySQL version 5.x
Unfortunately no access to Web Server Log files
PHP Log file reveals nothing
My PHP not up to scratch and will appreciate someone checking the zero balance condition and why it will cause this issue.