Why are non-Latin characters displayed as garbage in PDF/PS reports?
This is a limitation of the built-in fonts of PS and PDF formats. To print non-Latin text, use the Print… in the format selection menu of the report dialog. This will use the gnome-print backend, which supports PS and PDF creation, as well as direct printing. (Note: you might need to install gnome-print separately as it is not required for GRAMPS). If you only have Latin text, the PDF option will produce a smaller PDF compared to that created by gnome-print, simply because no font information will be embedded.