[NTG-context] Columnsets not balanced

Dear list, In the following example I would like to have the two columns balanced, i.e. with equal number of lines in both columns. But contrary to the option in the definition, all text is put in the leftmost column and the right-hand column remains empty. \definecolumnset[Two][balance=yes] \starttext \startcolumnset[Two] \input knuth \stopcolumnset \stoptext How can I automatically obtain balanced columns? Sytse Knypstra