https://bugzilla.redhat.com/show_bug.cgi?id=1648612
--- Comment #1 from Hin-Tak Leung htl10@users.sourceforge.net --- In case anybody is insterested, the actual Font Validator reports are up at: https://github.com/HinTak/FontVal-Tests-at-10pt
and it is E6047 , Storage index out of range .