This issue has now been resolved, and invoice PDF can be downloaded and opened properly.
Posted Feb 16, 2017 - 20:33 PST
Monitoring
Our teams have deployed a fix at 6.15pm pst and are observing PDF generation functioning normally.
Posted Feb 16, 2017 - 19:31 PST
Identified
We have identified the cause and a fix is being reviewed and tested now.
Posted Feb 16, 2017 - 11:34 PST
Investigating
We are currently investigating reports from customers using our legacy Invoice PDF/Word generation are experiencing issues with this service. This is only impacting a small subset of customers.