Check that exec() is enabled on the server

speaking on OP's behalf:

The same server has another copy of the site and the same PDF file works as expected there. Comparing the fillpdf settings of the 2 i see the 1 which is not working has no options available for Server Locale (the working one has en_US.utf8). But looking in the db i see the correct value is assigned in the config table for fillpdf.settings (possibly because i set the value in the settings.php to see if that helped).

nvm.. problem solved. exec is not enabled on the server.

wonder if it wouldn't be a bad idea to have FillPDF to a check for exec and list on the state report if not enabled?

Confirming that this issue can be closed. Exec just needed to be enabled for the domain on the server.

Patch welcome.