(CC’ing the Context list.) ········· > Do you have a prediction about how long it will take before a fix is > released? No, sorry. What I do have though is the culprit: c70b2e466bbb07e976f8684d56ae4e5398169e7d is the first bad commit commit c70b2e466bbb07e976f8684d56ae4e5398169e7d Author: Hans Hagen Date: Sat Mar 22 15:31:00 2014 +0100 beta 2014.03.22 15:31 ... See the commit diff [0]. @Hans: Here is a minimal example for Luatex-Plain: https://bitbucket.org/phg/lua-la-tex-tests/src/8d48db1435bbd70888381a6cacd2281688d0d0b6/pln-math-1-prime.tex With the last good commit (244a447.. dated 2014.02.14 in the Garden repo) both primes are typeset correctly. With c70b2e46.. -- which is unfortunately the first snapshot after Marious’ mirror went dark -- the second one doesn’t take the ssty feature into account. Best regards, Philipp [0] https://bitbucket.org/phg/context-mirror/commits/c70b2e466bbb07e976f8684d56ae4e5398169e7d