So we made a small hangman game, and because we are Hungarians we have those irritating accented characters. libGDX can perfectly draw these on Android and Linux, but it just skips them on Windows. I have included 3 screenshots from the 3 systems. The font is self-made ttf font, I have also included, it only has the required letters.
When generating the font I included the characters like so:
parameter.characters = "aábcdeéfghiíjklmnoóöőpqrstuúüűvwxyz_"
So I ended up using the Apache commons-IO library and specifying utf-8 encoding for reading the file, as it turned out that was the problem.