[NTG-context] grid

Dear ConTeXt users, I did some experimenting with grids and there is one thing that puzzles me: when I switch between one and two columns as in the following example ///////////////////////////////////////////////////////////////// \setuplayout[grid=yes] \setupcolumns[n=2] \starttext \showgrid Hello! \startcolumns Hello! \stopcolumns Hello! \stoptext ///////////////////////////////////////////////////////////////// the last line isn't placed on the grid. What am I missing? (I used luatex 0.66 and mkiv). Kind regards, Matthias Vettel