I made a font using the example "Font make.cpp", and tested if it works good:

Now I'm trying to use that font with gui elements, and It doesn't render properly polish characters:

but It works ok with the default font :

maybe just ś doesn't work (I don't see it on the first screen)
please try drawing ś just after creating font.
if it works in font creation, but doesnt work in Gui Editor, please let me know

"ś" works ok in the font creation tutorial :

are you sure that you're saving the font to the file which is used in the TextDS font (in Gui Editor)?

if yes, can you send me the generated ".font" file and source font "ttf" so I can check the problem?

I copied the .font file once again and it have 676 kb while my old file have 350 kb, so I think the font I generated first time had some errors, It works ok now, sorry for problem, my mistake