Your problem is unrelated to \typesetbuffer and can be reproduced with the following example:24. April 2016 um 12:23Dear list,
I have the following sample:
\startbuffer[buffer:inside]
\definefontfamily[mainface][rm][TeX Gyre Pagella]
\setupbodyfont[mainface, 17pt]
\starttext
\input zapf
\stoptext
\stopbuffer
\starttext
\typesetbuffer[buffer:inside]
\stoptext
The issue I’m experiencing is that no mainface is selected if the font
size is specified in \setupbodyfont.
Am I missing something or have I hit a bug?