Hello again. After some research, i found what (I think is a bug) in \definefallbackfamily. Check the following code: \starttypescript [serif] [Minion] \definebodyfont [default] [rm] [tf=name:minionproregular sa 1, it=name:minionproit sa 1, mb=name:minionpromedium sa 1, mi=name:minionpromediumit sa 1, bf=name:minionprobold sa 1, bi=name:minionproboldit sa 1] \stoptypescript \definefallbackfamily [Minion] [mm] [Minion] [tf=name:minionprobold,preset=math:digitsnormal] \definefallbackfamily [Minion] [mm] [Minion] [tf=name:minionprobold,preset=math:lowercaseitalic] \definetypeface [Minion] [rm] [serif] [Minion] \definefontfamily [Minion] [mm] [TeX Gyre Pagella Math] \setupbodyfont [Minion] \starttext \startformula abcy123 \stopformula \stoptext Log: selectfont > The requested fallback font 'Minion' for typeface 'Minion' style 'mm' was ignored because no files where found. As you can see, \definefallbackfamily works just fine in numbers, but unfortunately fails in lowercaseitalic. This is a bug? Thanks