I know your problem. You must change font in PPM. Open with PPModd original PPM and export to binary all 4 subchunks from chunk VFNT. Next import it to your modded PPM. Select one of subchunks and press right mouse key and select "import from binary". Do it for all 4 subchunks, but remember to change with same order. (from subchunk DIGI from original to subchunk DIGI in modded)