Hi all: I have this minimal example (thanks to Pablo and Charles): \mainlanguage [es] \definefallbackfamily [mainface] [rm] [New Athena Unicode] [preset = range: greek, force = yes] % \definefallbackfamily [mainface] [rm] [Old Standard] % [preset = range: greek, force = yes] \definefontfamily [mainface] [rm] [TeX Gyre Pagella] \definefontfamily [mainface] [ss] [TeX Gyre Heros, scale = 0.75] \setupbodyfont [mainface] \starttext Spanish text \input tufte Greek Text: Μετὰ δὲ ταῦτα οὐ πολλαῖς ἡμέραις ὕστερον ἦλθεν ἐξ Ἀθηνῶν Θυμοχάρης ἔχων ναῦς ὀλίγας · καὶ εὐθὺς ἐναυμάχησαν αὖθις Λακεδαιμόνιοι καὶ Ἀθηναῖοι, ἐνίκησαν δὲ Λακεδαιμόνιοι ἡγουμένου Ἀγησανδρίδου. \stoptext I compile with TeXLive 2020 and Windows 10. I have the two fonts (New Athena Unicode and Old Standard) installed on my system but with New Athena Unicode it does not compile; on the other hand, with Old Standard it does compile. I do not know what I can do. Thanks for the help. Manuel González.