When I launch any graphics programs, whitch is using DEFAULT_FONT, I can't display any text in this font .

I've found this happens when you open the program from within Win95,
and the Dos box font setting is something other than "Auto". Either
run from the full screen dos prompt, or create a .pif file for the
program (i.e. a shortcut) with the font set to "Auto".

Problem is specific GRX, i.e. not really a DJGPP bug.