Jairo A. del Rio schrieb am 07.10.2019 um 00:18:

Here is my "minimal" example. As I need fallbacks, they remain. Only the fallback for greek is needed, anything else can be removed. [...]

As before, TOC shows "α Vaya" but subsection headers only show "Vaya", without Greek letters. By the way, Quivira supports Greek characters, so I don't know where the problem comes from. Below is a much shorter version of your example to demonstrate the problem.

The problem is a check in the section command which fails when the character comes from a fallback font. I will post a even simpler version of the problem for Hans to fix. \setuphead [section] [conversion=g] \definefallbackfamily [mainface] [rm] [DejaVu Serif] [range=greekandcoptic] \definefontfamily [mainface] [rm] [Latin Modern Roman] \definefontfamily [mainface] [mm] [Latin Modern Math] \setupbodyfont [mainface] \starttext \placecontent \section{wow} \stoptext Wolfgang