[NTG-context] dx in setuplayout problem

Hi all, Trying to print visit cards as in http://wiki.contextgarden.net/BusinessCard I encounter a problem as the location=middle seems not to work as expected. Here is my minimal example: ................ \definepapersize[BC][width=85mm,height=54mm] \definelayer[blocks][width=85mm,height=54mm] \setuppapersize[BC][A4] \setuplayout[nx=2,ny=5,dx=10mm] \setuplayout[location=middle,width=fit,height=fit] \setuppagenumbering[state=stop] \showframe[edge] \starttext moi et moi \stoptext ................. There is no symmetry in the output as can be seen in the attached file. This symmetry problem disappears if I drop the «dx=10mm» so maybe the trouble lies in this instruction. Sorry if this question already arised. -- Jean