[NTG-context] built-in units command (mkiv) fails

Hi there, Did / Do I miss something or is there a problem with the built-in \unit command? minimal example: %%%% start example %%%% \starttext 10 \unit{km/h} \stoptext %%%% stop example %%%% output: "10 kilometersolidushour" ConTeXt: ver: 2012.08.16 22:20 MKIV fmt: 2012.8.22 Similar results are obtained for all examples in the "Using the built-in command" on http://wiki.contextgarden.net/Units Cheers, Andreas