[NTG-context] liga not working

Hi there, using the following code: \usemodule[simplefonts][size=50pt] \setmainfont[FreeSerif] \starttext fi {\it fi} \stoptext I get ligatures when using TeX Gyre Termes, but not with FreeSerif, Old Standard or Theano Didot. AFAIK, all fonts have the liga feature correctly defined. What am I doing wrong? Thanks for your help, Pablo -- http://www.ousia.tk