Just did some tests (on a mac) :
- export and print as pdf initially both come out white. it is, however, fine in jpg / png
- if I turn off the pattern fill, suddenly, I get colours. so Pattern fill is the issue.
- Tried with various “white line” and “translucent line” fills, same problem. Only the “black line” works properly and export as a pdf fine.
So, the trouble lies with the white / translucent lines fills on a mac ?