Found a problem with both Libreoffice and Openoffice when printing DL Envelopes. Basically cant get the format landscape/portrait correct. Results in printing address on envelope to be the wrong way round. That is always prints as if there is an A4 sheet in printer - does not turn the address by 90 degrees to print sideways.
Incidentally, I do not know whether it is my set-up, but also can get the measurement to be anything other then inches.
I am en_GB where mm are normally shown/used.
The problem exists in both 10.4 and 11 of freebsd.
This is likely a problem with the CUPS configuration for the printer being used.