We had an unexpected glitch with PDF generation that affected orders placed in the last 28 hours.
In some cases PDF files were not generated at all. It has now been fixed. Any affected users, please, use Generate Files Again feature on these orders. This feature can be found in order menu for every order. Only holders of printer account can use this feature.
Apologies for the hiccup. A credit goes to David from Postcardz Home for raising it.