Adding

\definefontfeature[fraction][frac=yes]
\definehighlight[textfraction][style={\feature[+][fraction]}]

fixes the problem in the sample just sent.

Sorry for the misfire.

Alan

On Mon, Jul 10, 2017 at 1:53 PM, Alan Bowen <bowenalan03@gmail.com> wrote:
Has there been a change to \textfraction?

Try
1\textfraction{1/2}.

I get 
1 /1/2
with ConTeXt  ver: 2017.06.30 (and earlier on the wiki)

Alan