Trying to set up custom paper sizes for the Built-in PDF printer, but they do not persist after closing and reopening Draftsight (version 2018 x64 SP3 on Windows).

Tried saving the configuration, importing it, activating it at the Print Configuration Manager - nothing

Tried saving the drawing - nothing

Tried using the default paper size name ('User_0') - nothing

After closing and reopening the program, the saved configuration is recognized and gets applied to the sheet but all (if more than one) custom paper sizes are gone, including the one that was selected, and one of the built-in ones is selected in its place.

What's strange is, the dimensions of the custom paper size persist in the layout view. But in the print / configuration dialog it's nowhere to be found.

Is this expected behavior? Am I missing something?

Many thanks!