Hi Pablo, I think this is a problem with the Unifraktur Maguntia font. I just downloaded it [1], and measured it using \blackrule -- and the x-height is indeed ridiculously low. [1] from here: http://unifraktur.sourceforge.net/maguntia.html \setupinterlinespace[line=3.2ex] \usemodule[simplefonts] \setmainfont[UnifrakturMaguntia] \starttext xAAgfas\smash{\blackrule[height=1ex]}\smash{\blackrule[height=2mm]\\ xAAgfas\smash{\blackrule[height=2ex]}\\ xAAgfas\smash{\blackrule[height=3ex, color=red]}\\ xAAgfas\smash{\blackrule[height=3.2ex, color=blue]}\\ \stoptext Probably best to take this up with the font designer? I have no idea how a font is supposed to declare its x-height. (I get the impression that `font-con.lua` queries some parameter called 'xheight' or 'x_height', but you should take these impressions of mine with a grain of salt.) Cheers, Sietse