> With osx preview? How small can you make that test (try removing characters) till it shows up ok.

yes, OSX 10.11.6 preview
Most likely an issue with OSX preview.
The pdf show correct on Ubuntu

.F


the error will stay all the way down:

\starttext
conText
\stoptext






\starttext
conTest
\stoptext




\starttext
conTest 123
\stoptext