Merry Xmas to you too Dean
Yes this is not standard in NAV, each partner has their own way of doing it (As do we), unfortunately as it is custom to each partner only your partner would have an idea of what might be wrong without access to your system
Your options here would be to request assistance from your current partner (Who wrote it and therefore should know what may have gone wrong), or we could arrange for remote access and assist but things are a bit wound down at the moment so it would be from the 2nd Jan onward
Just as a possibility though, I would suggest you ask your IT guys to restart the NAV / SQL server, this will reset the application server (Which a lot of partners use for pdf / email)
Also restart your local PC (or Terminal server) if that is what you use to reset the local connections
It is very possible that this may resolve the issues
Cheers
Neville