The PDF generation now works successfully after altering the Toolset Access settings as described, however it is not working in German, only in English. I have contacted the plugin author and they have access to our site to see why it works to generate the PDF in both languages, but in German the PDF is still showing in English.
So I guess this ticket with Toolset could be closed, because this related to the Toolset Access issue and PDF generation.
Yes you can go ahead and close here given that with the modified setting in access it now works. I found it a bit odd that it worked after switching the theme hence which lead me to believe that the issue was theme related.
However i'm happy to see that the issue is now resolved. Hopefully the plugin author can shed some light on why the PDF isn't generating in the selected language.